Preheat oven to 350 Degrees.
In a medium/large mixing bowl add bananas and mash them up well. Add the rest of the ingredients for the cake. Mix well until batter is smooth. Spray 2 (15 X 10 ) Cookie sheets well with baking spray or if you do not have baking spray grease and flour both pans. Bake for 15-20 minutes or until inserted toothpick comes out clean. Allow cakes to cool completely in pan. Once cakes are cool, spread the filling on one of the cakes. Then carefully flip the cake without icing on top of the cake with icing.