Banana Cupcakes with Cinnamon Cream Cheese Frosting Ingredients Cupcake Ingredients: 2 1/4 cup cake flour 3/4 teaspoon baking soda 1/2 teaspoon baking powder 1/2 teaspoon salt 1 1/2 cup mashed bananas (approximately 3-4 bananas, very ripe) 1/4 cup buttermilk 1 teaspoon vanilla extract 2 sticks (1 cup) unsalted butter 1 1/3 cup sugar 2