INGREDIENTS
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1/2 cup (1 stick) butter, at room temperature, plus more for pan
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1 cup granulated sugar
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2 large eggs
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1 1/2 cups unbleached flour
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1 teaspoon baking soda
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1 teaspoon salt
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1 cup mashed very ripe bananas
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1/2 cup sour cream
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1 teaspoon vanilla