INGREDIENTS
6
Egg whites, large
4
Eggs, large
1 cup
All-purpose flour
1 1/2 tsp
Baking powder
1 tsp
Baking soda
1/2 cup
Cake flour
1 3/16 cups
Cocoa powder, unsweetened
4 cups
Granulated sugar
3/4 tsp
Kosher salt
10 oz
Semi-sweet chocolate
3 tsp
Vanilla
3 cups
Butter, unsalted
1 cup
Greek yogurt or sour cream, plain
2/3 cup
Water