INGREDIENTS:— 1/4 lb of butter (room temperature)— 1 1/2 cups of sugar— 2 cups of flour— 1 teaspoon of baking soda— 2 teaspoons of baking powder— 2 eggs (beaten)— 8 tablespoons of sour cream— 2 teaspoons of vanilla— 2-4 over ripe bananas — walnuts (optional) IMAGE CREDIT: iStock / Getty Images Plus