INGREDIENTS
1/2 tsp
baking powder
1/2 tsp
baking soda
1 cup
bananas
1/2 cup
butter
1 large
egg
2 cups
flour
1/2 cup
granulated sugar
1/2 cup
light-brown sugar
2 1/2 Tbsps
milk
4 cups
powdered sugar
1/2 tsp
salt
1 cup
salted butter
1/4 cup
sour cream
1 small
vanilla beans
1 tsp
vanilla extract