Banana Cake

1 (18.25 ounce) package yellow cake mix
2 very ripe bananas, mashed
1 teaspoon baking soda

Preheat oven to 350 degrees F.
Prepare yellow cake mix according to package directions.
Mash bananas with the baking soda and stir into the cake mix batter. Pour batter into one greased and floured 9x13 inch baking pan. Bake for 35 minutes. Let cake cool thoroughly and top with homemade pudding. Refrigerate.