Step 1

Preheat oven to 350 degrees F. Coat a 9- x 13-inch baking dish with cooking spray.

Step 2

In a large bowl, prepare cake mix according to package directions. Stir in bananas until thoroughly combined. Pour batter into baking dish. Bake 35 to 40 minutes or until toothpick inserted in cake comes out clean. Let cool.

Step 3

Meanwhile, in a large bowl with an electric mixer, beat heavy cream, milk, and pudding mix until thickened. Frost cake, then refrigerate until ready to serve.