If you have ripe bananas hanging around, you’ll want to try this delicious sheet cake. It’s a rich banana cake swirled with Nutella and topped with a fudgy chocolate hazelnut frosting. This cake is delicious even on its own without the icing! Ingredients: 2 1/2  cups all-purpose flour 1 teaspoon baking powder 1 teaspoon baking soda 1…