INGREDIENTS
1
box yellow cake mix
3
eggs
1/2 cup
oil
1 cup
mashed bananas, about 2 small bananas
1/2 cup
sour cream or plain yogurt
2 tsp
vanilla extract
1 cup
butter, softened
1/2 cup
unsweetened cocoa powder
1/4 cup
milk or sour cream
2 tsp
vanilla extract
3 cups
powdered sugar