INGREDIENTS
4
Egg whites, large
1 1/4 cups
All-purpose flour
1 tsp
Baking powder
1/2 tsp
Baking soda
1 cup
Cake flour
4 cups
Confectioners' sugar
1/2 tsp
Kosher salt
1 pinch
Salt
1
Sparkling sugar
1 1/3 cups
Sugar
4 tsp
Vanilla, pure
1
Vanilla bean
1 1/2 cups
Butter, unsalted
1 tbsp
Heavy cream
1/2 cup
Milk
1 cup
Sour cream