Preheat your oven to 350°F (175°C). Generously coat the entire inside of your Tomte Cake baking pan with non-stick cooking spray, making sure to reach all crevices and roof peaks.
In a large bowl, whisk together the flour, baking soda, baking powder, salt, ginger, cinnamon, cloves, and nutmeg until the spices are evenly distributed with no visible streaks.
Melt the butter, then stir in the dark brown sugar until well combined. In a separate bowl, whisk together the milk and eggs, then very slowly pour this into the butter-sugar mixture, whisking continuously until smooth.
Pour the wet ingredients into the dry ingredients and stir with a rubber spatula until just fully incorporated—do not overmix. The batter will be thick, dark, and wonderfully fragrant.
Pour batter evenly into each house cavity, filling each about 2/3 to 3/4 full. If using a Tomte figurine, coat it in baking spray and flour, then drop it headfirst into one of the batter-filled cavities.
Bake at 350°F for 45–50 minutes, checking doneness at 45 minutes by inserting a toothpick into the center—it should come out clean or with just a few moist crumbs.
Let cakes cool in the pan on a rack for 10 minutes, then trim any overflow with a serrated knife and gently invert the pan to release. Cool completely (about 1 hour) before decorating.
Once fully cooled, frost with your preferred icing (buttercream, cream cheese, or royal icing) and embellish with candies, sprinkles, and edible decorations to bring your little houses to life.