INGREDIENTS
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1/2 cup butter, softened
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1 cup granulated sugar
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1 egg
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1 tsp vanilla extract
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3 medium bananas, mashed
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1 1/2 cup flour
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1 tsp baking powder
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1 tsp baking soda
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1/2 tsp salt
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1/4 cup baking cocoa
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1/4 cup nutella, melted (optional)
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1/4 cup walnuts (optional)