Mix cake mix, Baking Powder, Club Soda and mashed Bananas and pour in sprayed 9x13 pan, cook at 350 degrees. Bake about 1 hour until toothpick comes out clean.
Frosting: 16 Oz Fat Free Cool Whip and mix 1/2 Peanut Butter together and chill while cake bakes and cools.
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