INGREDIENTS
1
Egg, large
1 cup
All-purpose flour
3/4 tsp
Baking powder
1/4 tsp
Baking soda
1 1/2 oz
Chocolate, unsweetened
3/8 cup
Cocoa powder, Dutch-process
2 cups
Confectioners\' sugar
3/8 cup
Granulated sugar
1/2 tsp
Kosher salt
1 2/3 tbsp
Vanilla, pure
1
Vegetable oil
2 tbsp
Butter, unsalted
1/4 cup
Buttermilk
2 tbsp
Milk
1
Water