INGREDIENTS
1/2 cup
unsalted butter, room temperature
1 3/4 cups
cake flour
2 tsp
baking powder
1/2 tsp
salt
1 cup
sugar
3
large eggs, room temperature
1 tsp
pure vanilla extract
2/3 cup
buttermilk, room temperature
1/4 cup
plus 1 tablespoon Dutch-process cocoa powder
butter or spray for pan