INGREDIENTS
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For Bars
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1/2 cup unsalted butter (1 stick), softened
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1 1/3 cups sugar
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1 cup mashed bananas (2 large or 3 medium)
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1/2 cup sour cream or plain yogurt
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1 teaspoon vanilla
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2 cups unbleached all purpose flour
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1 1/2 teaspoons baking powder
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1/2 teaspoon baking soda
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1/4 teaspoon salt
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For Frosting
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1 (8-ounce) package of cream cheese, softened
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1/4 cup butter (1/2 stick), softened
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1 cup powdered sugar, sifted
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1 1/2 teaspoons vanilla extract