INGREDIENTS
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2 cups all-purpose flour
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1 ½ teaspoons baking powder
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1 teaspoon baking soda
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¾ teaspoon salt
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¾ cup sugar
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½ cup butter, melted (1 stick)
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½ cup buttermilk, divided
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2 eggs
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1 teaspoon vanilla
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2 ripe bananas, mashed (about 1 cup)
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FOR THE TOPPING
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¼ cup all-purpose flour
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¼ cup dark brown sugar
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¼ cup butter (½ stick)