INGREDIENTS
2 1/2 cups
cake flour (people at very high elevations should add an additional 2 tablespoons)
1 1/4 tsp
baking powder
1/4 tsp
baking soda
1/2 tsp
salt
1 3/4 cups
sugar, divided
1 cup
buttermilk, room temperature
10 tbsp
salted butter, melted and cooled slightly
3 tbsp
vegetable oil
1 tbsp
vanilla extract
6
room temperature eggs, separated (you’ll need 6 yolks and 3 whites; you can discard the extra whites)
cream of tartar
Optional: at least 1 cup rainbow sprinkles
FROSTING: