Whisk together mayonnaise, ketchup, yellow mustard, pickle juice, Worcestershire sauce, garlic powder, onion powder, and paprika in a small bowl until smooth. Refrigerate until ready to use.
Divide ground beef into 8 equal portions (about 3 oz or 85g each) and gently roll into loose balls. Refrigerate for at least 15 minutes.
Shred lettuce, slice tomato and onion, and drain pickle chips. Arrange all toppings for easy assembly.
Butter cut sides of buns and toast in a skillet over medium heat for 1-2 minutes until golden brown. Set aside cut-side up.
Increase heat to medium-high (400-450°F/200-230°C) until a drop of water sizzles and evaporates immediately. Do not add oil.
Place 2 cold beef balls on the hot skillet with space between. Place parchment paper over a ball and press firmly with a metal spatula until very thin (about 1/4 inch or 6mm). Repeat. Season tops with salt, pepper, and garlic powder.
Cook patties undisturbed for 2-3 minutes until edges are brown and crispy. Do not move or press again.
Scrape firmly under each patty with a thin metal spatula to release the crust, then flip. Immediately top each with one slice of American cheese and cook for 1 more minute until cheese is melted.
Transfer cooked patties to a plate and stack two patties together with cheese sides touching to create a double-patty burger. Repeat with remaining beef balls.
Spread special sauce on the bottom bun, add shredded lettuce, place double-stacked patties on top, then add tomato slices, onion slices, and pickle chips. Spread more sauce on the top bun and press down gently.