INGREDIENTS
1
Egg, large
1 3/4 cups
All-purpose flour, unbleached
1/2 tsp
Baking powder
1 1/2 tsp
Baking soda
3/4 cup
Cocoa powder, unsweetened
3 cups
Confectioners' sugar
1 cup
Granulated sugar
1/2 tsp
Kosher salt
1 1/2 tsp
Vanilla, pure
1 cup
Butter, unsalted
1 cup
Buttermilk
1/4 cup
Milk