Breakfast Casserole Recipe

A great breakfast casserole recipe is one of those dishes that makes everyone feel like the weekend arrived early. It brings the whole table together, feeds a crowd without breaking a sweat, and smells absolutely incredible coming out of the oven. Whether you’re hosting a holiday brunch or just want to make Sunday morning feel a little more special, this is the recipe you’ll turn to again and again.

What makes this version stand out is the combination of savory breakfast sausage, fluffy eggs, shredded cheddar cheese, and frozen hashbrowns all baked together in one big dish. The hashbrowns form a hearty base that soaks up all that cheesy egg mixture and crisps up just slightly at the edges, which gives every bite a satisfying texture contrast.

This isn’t a fussy recipe. You don’t need any fancy techniques or specialized equipment. You brown the sausage, mix up the egg custard, layer everything in a baking dish, and let the oven do the rest.

You can also assemble it the night before and bake it in the morning, which makes it a perfect make-ahead option for holidays, potlucks, or busy school days when you want a hot, wholesome breakfast without standing over the stove.

If you love easy baked egg dishes, you might also enjoy this Egg Bake Recipe for another simple weekday morning option.

Why You’ll Love This Breakfast Casserole Recipe

This dish has everything you want from a breakfast in one pan.

It’s filling, flavorful, and feeds anywhere from 8 to 12 people comfortably, which makes it ideal for gatherings.

The hashbrown base means you’re getting a full breakfast experience, including your protein, starch, and cheese, all in a single bake.

It reheats beautifully, so leftovers taste just as good the next morning with minimal effort.

You can customize it endlessly with different meats, veggies, and cheeses depending on what you have in the fridge.

Here’s a quick look at why this recipe works so well:

• Make-ahead friendly: Assemble the night before and bake fresh in the morning
• Crowd-pleasing: Serves 8 to 12 people from a single 9×13 baking dish
• Budget-friendly: Uses simple, affordable pantry and freezer staples
• Customizable: Swap the sausage for bacon or ham, add peppers or spinach, change up the cheese
• Beginner-proof: Straightforward steps that anyone can follow
• Comforting: That golden, cheesy top and creamy egg interior never gets old

Read Also: French Toast Casserole Recipe

Ingredients

This recipe uses simple, everyday ingredients that come together into something truly satisfying. The key here is using frozen shredded hashbrowns, which give the casserole structure and a slightly crispy edge, especially around the sides of the pan. Full-fat shredded cheddar melts the best and gives the most flavor, so skip the pre-shredded bag if you can and grate it fresh for better melt and taste.

• 1 lb (450g) ground breakfast sausage (pork, turkey, or mild Italian)
• 1 medium yellow onion, finely diced (about 1 cup / 150g)
• 1 green bell pepper, finely diced (about 1 cup / 150g)
• 1 red bell pepper, finely diced (about 1 cup / 150g)
• 3 cups (340g) frozen shredded hashbrowns, thawed and patted dry
• 10 large eggs
• 1 cup (240ml) whole milk
• 1 teaspoon garlic powder
• 1 teaspoon onion powder
• 1/2 teaspoon smoked paprika
• 1/2 teaspoon salt, or to taste
• 1/2 teaspoon black pepper
• 2 cups (200g) sharp cheddar cheese, freshly shredded and divided
• Cooking spray or butter, for greasing

For another potato-based baked breakfast, take a look at this Hashbrown Casserole Recipe.

Kitchen Equipment Needed

You don’t need any special tools for this recipe, but a few key items will make the process smoother. A large nonstick skillet is essential for browning the sausage properly without it sticking. A sturdy 9×13 baking dish is the standard size for this recipe and ensures even cooking throughout.

• 9×13 inch baking dish
• Large nonstick skillet or cast iron pan
• Large mixing bowl
• Whisk
• Wooden spoon or rubber spatula
• Knife and cutting board
• Measuring cups and spoons
• Aluminum foil
• Box grater (if shredding cheese fresh)
• Paper towels (for patting hashbrowns dry)

You might also enjoy: Tater Tot Casserole Recipe

Recommended Products for This Recipe

These are products I genuinely recommend based on quality and performance. Each one helps ensure you get the best possible result from this breakfast casserole recipe.

1. Pyrex 9×13 Glass Baking Dish

A good glass baking dish heats evenly and lets you monitor the bottom of your casserole for doneness without guessing. The clear sides make it easy to see when your eggs are fully set. It’s also dishwasher safe and incredibly durable.

Get it on Amazon

2. Lodge Cast Iron Skillet

Browning sausage in a cast iron skillet gives you better color and more flavor from the Maillard reaction than a thin nonstick pan. The even heat retention also helps cook the sausage through without burning the outside. This is a lifetime investment that improves with every use.

Get it on Amazon

3. OXO Box Grater

Freshly grated cheese melts far more smoothly than pre-shredded cheese, which is coated in anti-caking agents that inhibit melting. A sturdy box grater makes the job quick and easy. The OXO version has a comfortable handle and a non-slip base that keeps it steady while you work.

Get it on Amazon

4. OXO Good Grips Whisk

A comfortable, sturdy whisk is essential for fully emulsifying the egg and milk mixture so the custard bakes up smooth and creamy. Flat or balloon-style whisks both work well here. Look for a whisk with a comfortable grip that won’t slip when your hands are wet.

Get it on Amazon

Another favorite: Egg Bites Recipe

Step-by-Step Instructions

1. Thaw and Prep the Hashbrowns

• Remove your frozen shredded hashbrowns from the freezer and place them in a colander.
• Allow them to thaw at room temperature for at least 30 minutes, or thaw overnight in the refrigerator.
• Once thawed, transfer the hashbrowns to a clean kitchen towel or several layers of paper towels.
• Squeeze and press firmly to remove as much moisture as possible. This step is critical: wet hashbrowns will release steam inside the casserole and make it watery.
• Set the dried hashbrowns aside until ready to assemble.

2. Preheat the Oven and Grease the Pan

• Preheat your oven to 350°F (175°C).
• Spray your 9×13 inch baking dish generously with cooking spray, or rub it with softened butter, making sure to coat the sides and corners.
• Set the greased dish aside on the counter.

3. Brown the Sausage

• Place your large skillet over medium-high heat and allow it to heat for about 1 minute.
• Add the 1 lb (450g) of ground breakfast sausage to the pan, breaking it up with a wooden spoon or spatula as it cooks.
• Cook for 5 to 7 minutes, stirring occasionally, until the sausage is fully browned with no pink remaining.
• Using a slotted spoon, transfer the cooked sausage to a plate lined with paper towels to drain. Leave the drippings in the pan.
• Do not discard all the drippings; leave about 1 tablespoon in the pan for cooking the vegetables.

4. Sauté the Vegetables

• Return the skillet to medium heat. If there is no drippings left, add 1 teaspoon of olive oil or butter.
• Add the finely diced yellow onion to the pan. Cook for 2 to 3 minutes, stirring frequently, until softened and just beginning to turn translucent.
• Add the diced green and red bell peppers. Cook for another 3 to 4 minutes until they are slightly softened but still have a bit of texture.
• Season with a small pinch of salt and pepper.
• Remove the pan from heat and set the vegetable mixture aside to cool for a few minutes.

5. Whisk the Egg Mixture

• Crack the 10 large eggs into your large mixing bowl.
• Add the 1 cup (240ml) of whole milk to the bowl.
• Add the 1 teaspoon garlic powder, 1 teaspoon onion powder, 1/2 teaspoon smoked paprika, 1/2 teaspoon salt, and 1/2 teaspoon black pepper.
• Whisk vigorously for at least 60 to 90 seconds until the eggs and milk are fully combined, the yolks are completely broken down, and the mixture looks uniform in color. A well-whisked base means the casserole will bake up light and creamy rather than rubbery.
• Add 1 1/2 cups (150g) of the freshly shredded cheddar cheese to the egg mixture and stir to combine. Reserve the remaining 1/2 cup (50g) of cheese for the topping.

6. Assemble the Casserole

• Spread the dried and thawed hashbrowns in an even layer across the bottom of your greased 9×13 baking dish. Press them down gently with the back of a spoon so they form a compact, even base.
• Scatter the drained cooked sausage evenly over the hashbrown layer.
• Spoon the sautéed onion and bell pepper mixture evenly over the sausage.
• Pour the egg and cheese mixture slowly and evenly over all the layers, making sure it reaches the corners and edges of the dish.
• Give the dish a gentle shake to help the egg mixture settle into all the nooks and crannies.
• Sprinkle the reserved 1/2 cup (50g) of shredded cheddar cheese evenly over the top.

7. Bake the Casserole

• Cover the baking dish tightly with aluminum foil. This traps moisture and steam during the first part of baking, helping the eggs cook gently and evenly without drying out.
• Place the covered dish in the preheated 350°F (175°C) oven.
• Bake covered for 35 minutes.
• After 35 minutes, carefully remove the foil. The edges should look mostly set at this point.
• Return the dish to the oven uncovered and bake for an additional 20 to 25 minutes, until the cheese on top is golden and bubbling and the center of the casserole is fully set.
• To check for doneness, insert a knife or toothpick into the center of the casserole. It should come out clean with no runny egg mixture clinging to it.
• If the top is browning too quickly before the center is cooked through, tent loosely with foil for the remaining time.

8. Rest and Serve

• Remove the casserole from the oven and let it rest on a wire rack or trivet for 5 to 10 minutes before slicing.
• This resting period allows the egg mixture to firm up slightly, which makes slicing much cleaner and keeps everything from falling apart on the plate.
• Slice into squares and serve warm, straight from the baking dish.

This casserole pairs beautifully with a side of Sausage Gravy spooned over the top for an extra indulgent brunch spread.

Tips for Success

Getting this casserole perfect every single time comes down to a few key habits. The biggest mistake people make is skipping the hashbrown drying step, which leads to a watery casserole that doesn’t hold its shape when sliced. Equally important is giving the dish enough resting time after it comes out of the oven so it can set properly.

• Dry your hashbrowns thoroughly: Squeeze out as much moisture as possible before layering them in the dish. This single step is the biggest factor in whether your casserole holds together cleanly or turns soggy.
• Whisk the eggs well: Give the egg mixture a good 60 to 90 seconds of vigorous whisking. Fully emulsified eggs bake up smoother and creamier.
• Cool the sausage and veggies before adding: Adding hot filling directly to the egg mixture can begin to cook the eggs prematurely. Allow your cooked sausage and vegetables to cool for at least 5 minutes first.
• Don’t skip the foil for the first bake: Covering the dish for the first 35 minutes keeps moisture in and prevents the top from drying out before the center is cooked.
• Shred your own cheese: Pre-shredded cheese contains anti-caking agents that prevent it from melting as smoothly. A freshly grated block of cheddar melts into silky pools and tastes noticeably better.
• Use whole milk for best results: Whole milk gives the egg custard a richer, creamier texture compared to lower-fat milks.
• Rest before slicing: Even 5 minutes of rest time makes a significant difference in how cleanly the casserole slices.
• Make it the night before: This casserole actually benefits from an overnight rest in the fridge before baking. The hashbrowns and egg mixture have time to meld together, resulting in a more cohesive texture.

Read Also: Breakfast Skillet Recipe

Serving Suggestions

This breakfast casserole is hearty enough to stand entirely on its own, but it really shines when served alongside a few bright, fresh accompaniments that balance out its richness.

A bowl of fresh Fruit Salad is the classic pairing here, cutting through the savory, cheesy richness with something light and refreshing. A drizzle of hot sauce on individual portions adds a welcome kick, especially with the spiced hashbrown base. Here are some great options to serve alongside:

• Fruit Salad for a fresh, colorful contrast
• Avocado Toast for a creamy, trendy side
• Scrambled Eggs for an extra protein boost for big appetites
• Cracker Barrel Pancakes for a sweet and savory brunch spread
• Baked Oatmeal for a lighter, fiber-rich companion dish
• Easy Waffles for a full brunch buffet setup
• Fresh orange juice, coffee, or a mimosa to wash it all down
• Hot sauce, sour cream, or salsa on the side for people to customize their own slice

Variations to Try

One of the best things about a breakfast casserole is how flexible it is. Once you understand the basic ratios of egg to dairy to filling, you can swap in almost anything and it will still bake up beautifully. Here are some popular directions you can take this recipe:

• Bacon version: Swap the sausage for 1 lb (450g) of cooked and crumbled bacon. Cook the bacon until crispy, drain thoroughly, and use it in place of the sausage in the assembly step.
• Ham and Swiss: Replace the sausage with 2 cups (300g) of diced cooked ham and swap the cheddar for Swiss or Gruyere cheese. This version leans more elegant and is wonderful for Easter or Mother’s Day brunch.
• Vegetarian: Skip the meat entirely and double up on the vegetables. Add sliced mushrooms, baby spinach, and diced zucchini for a colorful, vegetable-packed version. Make sure to sauté all vegetables thoroughly and drain any excess moisture before adding.
• Spicy kick: Use spicy breakfast sausage and add a diced jalapeño to the vegetable sauté. Top with pepper jack cheese instead of cheddar for a casserole with heat in every bite.
• Loaded potato version: Add 1 cup (150g) of frozen diced potatoes alongside the hashbrowns for an even heartier, more potato-forward base. This is especially satisfying in cooler months.
• Tex-Mex: Add 1 can of drained green chiles, 1/2 teaspoon cumin, and swap the cheddar for Monterey Jack. Serve with salsa and sour cream on the side.

You might also enjoy: Broccoli Casserole Recipe

Storage and Reheating

This casserole stores and reheats extremely well, making it a reliable option for meal prep. Leftovers taste just as good the next day, which makes the effort of baking a whole pan even more worthwhile.

• Refrigerator: Allow the casserole to cool completely at room temperature, then cover the baking dish tightly with plastic wrap or transfer individual portions to airtight containers. Refrigerate for up to 4 days.
• Freezer: Wrap individual portions tightly in plastic wrap and then in aluminum foil, or seal them in freezer-safe bags. Freeze for up to 2 months. Thaw overnight in the refrigerator before reheating.
• Microwave reheating: Place a single portion on a microwave-safe plate and heat on medium power for 1 to 2 minutes, checking and rotating halfway through to heat evenly.
• Oven reheating: Place portions in an oven-safe dish, cover with foil, and warm at 325°F (160°C) for 15 to 20 minutes until heated through. This method restores the texture best.
• Make-ahead instructions: Assemble the casserole up to the point of baking, cover tightly, and refrigerate overnight. Remove from the fridge while the oven preheats and bake as directed, adding 5 to 10 extra minutes to the covered baking time since the dish will be cold.

Read Also: Potato Casserole Recipe

Nutritional Facts

The following values are approximate per serving, based on 10 servings from one 9×13 pan using full-fat cheddar cheese and pork sausage.

Nutritional values will vary based on the specific brands and types of ingredients used, particularly the sausage and cheese. Using turkey sausage and reduced-fat cheese can significantly reduce the total fat and calorie count per serving.

This casserole pairs well with a light side like this Cloud Eggs Recipe if you’re looking to balance out the meal.

Health Benefits of Key Ingredients

While this is a comforting, indulgent dish, several of its core ingredients offer real nutritional value.

Eggs are one of the most complete sources of protein available, providing all nine essential amino acids along with vitamins D, B12, and choline, which supports brain function and liver health. The bell peppers in this recipe are surprisingly high in vitamin C, with red bell peppers containing more than twice the amount found in an orange, which supports immune health and skin collagen production.

Here’s a closer look at the health benefits of the key ingredients:

• Eggs: Rich in complete protein, healthy fats, vitamins D and B12, and choline. One large egg contains approximately 6 grams of protein.
• Bell peppers: Excellent source of vitamins C and A, plus antioxidants like carotenoids that support eye and immune health.
• Onions: Contain quercetin, an antioxidant with anti-inflammatory properties, along with prebiotic fiber that supports gut health.
• Garlic powder: Derived from garlic, which is well-known for its allicin content, a compound with antimicrobial and cardiovascular benefits.
• Cheese: A good source of calcium and phosphorus for bone health, along with fat-soluble vitamins A and K2.
• Smoked paprika: Contains capsaicin and antioxidants including vitamin A, which supports vision and immune function.

Another healthy breakfast to try: Shakshuka Recipe

Frequently Asked Questions

1. Can I make this breakfast casserole the night before?

Yes, absolutely. This is one of the best qualities of this recipe. Simply assemble the casserole fully, cover the dish tightly with plastic wrap or foil, and refrigerate it overnight. In the morning, remove it from the fridge while the oven preheats to take the chill off slightly, then bake as directed. You may need to add 5 to 10 extra minutes to the covered baking time since the dish will be starting from a cold temperature.

2. Can I use fresh potatoes instead of frozen hashbrowns?

You can, but it takes a bit more preparation. Shred fresh russet potatoes using a box grater, then soak them in cold water for 10 minutes to release excess starch. Drain, rinse, and squeeze them out thoroughly before using. Fresh-grated potatoes will work in the same quantity but benefit from a quick sauté in a lightly oiled skillet for 4 to 5 minutes before layering into the casserole to ensure they cook through properly during baking.

3. How do I know when the casserole is fully cooked?

The most reliable test is to insert a sharp knife or toothpick into the very center of the casserole. If it comes out clean, with no wet or runny egg mixture, the casserole is done. The edges will be set and pulling away from the sides of the dish, and the top should be golden and bubbling. Another sign is that the casserole won’t jiggle in the center when you gently shake the pan.

4. Can I freeze the breakfast casserole before baking?

Yes. Assemble the entire casserole, cover it tightly with a double layer of plastic wrap followed by aluminum foil, and freeze for up to 2 months. When you’re ready to bake, thaw it completely overnight in the refrigerator, then let it sit at room temperature for 20 minutes while the oven preheats. Bake as directed, extending the covered baking time by 10 to 15 minutes since the dish will be colder than usual when it enters the oven.

5. What can I use instead of sausage?

This recipe works well with a variety of breakfast proteins. Cooked and crumbled bacon is the most popular substitute. Diced cooked ham is another great option, especially when paired with Swiss or Gruyere cheese. Turkey sausage works as a leaner alternative and behaves identically to pork sausage in the recipe. For a fully vegetarian version, simply omit the meat and increase the volume of sautéed vegetables to compensate.

Read Also: Quiche Lorraine Recipe

Final Thoughts

This breakfast casserole recipe is the kind of dish that earns a permanent spot in your recipe rotation.

It’s genuinely simple, endlessly adaptable, and delivers on flavor every single time.

The combination of crispy hashbrowns, savory sausage, fluffy baked eggs, and golden melted cheese is hard to beat on any morning of the week.

If you’ve never made a breakfast casserole before, this is the perfect place to start. The steps are forgiving, the ingredients are affordable, and the results are something the whole table will dig into happily.

Give it a try this weekend or prep it the night before for a stress-free holiday morning. Then come back and leave a comment below to let us know how it turned out!

If you loved this recipe, share it with a friend who could use a great make-ahead breakfast idea.

Recommended:

• Loaded Breakfast Skillet Recipe
• Breakfast Burrito Recipe
• Breakfast Potatoes Recipe
• Air Fryer Egg Cups Recipe
• Air Fryer Egg Bites Recipe
• Easy French Toast Recipe
• Homemade Biscuit Recipe
• Pumpkin Pancake Recipe
• Green Bean Casserole Recipe
• Sweet Potato Casserole Recipe