I found this simple but delicious dessert somewhere on line but don't remember where. Anyway, though I rarely, rarely used boxed cake mixes, or any prepackaged food this one is very good.

Banana Cake

1 yellow cake mix prepared per instructions (I used milk in place of the water)
4 ripe bananas, mashed with 1 teaspoon baking soda.
Fold the banana mixture into the prepared cake mix.

Put in a well greased and floured 9X13 pan.

Bake at 350 for 35 to 40 minutes, until a toothpick comes out clean.

Cool completely

Frosting

1 pkg. instant vanilla pudding prepared with 1 cup cold milk. When set, mix in 1 8 oz. tub of Cool whip topping. Spread on cake, and refrigerate.

I added l/4 cup sour cream when mixing the cake mix.
Also added l/4 cup ground flax at the same time.

This is really a very moist dessert. I am sure you could use several different cake mixes also. Spice cake comes to mind.

Sliced bananas added on top of the frosting would be nice, when serving.