Preheat the oven to 350ºF. Grease and flour dust 3X8" or 2X6"cake pans. Set aside.
In a medium bowl, whisk together the flour, cornstarch, salt, and baking powder.
2½ cups All-purpose flour, ¼ cup Corn starch, 2 teaspoon Baking powder, 1 teaspoon Salt
In a stand mixer fitted with the paddle attachment, cream together the butter and sugar until light and fluffy, 3 to 5 minutes. Add in the egg whites, one at a time, mixing well after each one. Add the oil and the extracts.
1 cup Butter, 4 Egg whites, 1½ cups Sugar, 1 tablespoon Clear imitation vanilla, 1 teaspoon Almond extract
With the mixer running on low, add the dry ingredients and the milk in three alternating batches and mix until just barely combined, using a rubber spatula, gently fold in the sprinkles until they're evenly distributed.
¾ cup Milk, ½-¾ cup Rainbow sprinkles
Pour the batter into the prepared pans, and bake for 25-30 minutes. Or until an insert to the center comes out clean.
Let cool for 10 minutes, then transfer to a cooling rack, and let cool completely before decorating.
This cake is frosted with swiss meringue buttercream, SMBC, Please see my step by step instructions on how to make SMBC.