Banana Layer Cake Recipe. Place one layer of cake on a serving plate. Grease only the bottom of a Pyrex 9X13 inch Deep Baking Dish.
Mix mashed bananas buttermilk and 1 teaspoon vanilla in another medium bowl. Line a 14 sheet pan with parchment paper then spray the bottom on top of the parchment and sides of the pan with nonstick cooking spray. Add enough water to the reserved banana juice to make 14 cup.
Using electric mixer beat 12.
2 cups cake flour 1 teaspoon baking powder ¾ teaspoon baking soda ½ teaspoon salt 8 tablespoons 1 stick unsalted butter at room temperature 1¼ cups. Pour the cake mix into the bowl. Next mix in the bananas and buttermilk in two installments on a low speed. In a small bowl whisk together mashed banana yogurt or buttermilk and vanilla.