INGREDIENTS
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4 tablespoons butter, softened
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1/2 cup sugar
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1 whole egg
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1 teaspoon pure vanilla extract
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2 bananas, mashed
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1 cup all-purpose flour, divided
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1/2 teaspoon ground cinnamon
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1/2 teaspoon baking soda
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1/4 teaspoon baking powder
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1/4 teaspoon salt
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1 cup fresh blueberries