INGREDIENTS
3
Egg whites
1 2/3 cups
All purpose flour
1 tsp
Baking powder
1/4 tsp
Baking soda
3 cups
Powdered sugar
1/4 tsp
Salt
1 cup
Sugar
2 tbsp
Vanilla
1 1/2 sticks
Butter, unsalted
2 1/2 sticks
Butter
1/4 cup
Heavy whipping cream
1/2 cup
Milk
1/2 cup
Sour cream