INGREDIENTS
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1/3 cup butter, at room temperature
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3/4 cup granulated white sugar
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1 large egg
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1 cup mashed ripe banana
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1/2 cup milk
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1 1/2 cups all-purpose flou
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r3/4 tsp baking powder
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3/4 tsp baking soda
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1/4 tsp salt
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8 spoonfuls Nutella (or another chocolate-hazelnut spread)