INGREDIENTS
•
3 cups granulated sugar
•
3/4 cup (1 1/2 sticks/6 oz/170g) unsalted butter, softened
•
8 egg whites
•
1 1/2 cups regular or light sour cream
•
1 teaspoon baking soda
•
4 1/2 cups sifted cake flour
•
1/4 teaspoon salt
•
2 teaspoons vanilla extract
•
Cooking spray