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Preheat oven at 350⁰F/177⁰C. Grease, line with non-stick paper a 9x5-inch loaf pan. Set aside.
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In a bowl, mix together banana cake mix, oil, water and mashed bananas. Set aside.
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In another bowl, mix together chocolate cake mix, oil, water and mashed bananas.
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Pour the cake mixes unto the prepared pan alternately to make a marbled loaf. Using a toothpick, make swirl patterns on top of the loaf.
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Bake in the preheated oven for 25-30 minutes or until set. Serve.