INGREDIENTS
2
Egg whites, large
2
Eggs, large whole
1 1/2 tsp
Baking powder
1/2 tsp
Baking soda
2 1/2 cups
Cake flour
1 1/2 cups
Granulated sugar
4 cups
Powdered sugar
1/2 tsp
Salt
1
Seeds of 1 vanilla bean or 1 tsp vanilla extract
2 tsp
Vanilla extract
1 3/4 cups
Butter, unsalted
3/4 cup
Milk
4 tbsp
Milk or cream
1/4 cup
Sour cream
Sprinkles for decorating