INGREDIENTS
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1 stick (1/2 cup) unsalted butter
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1 cup granulated sugar
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2 large eggs, room temperature
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1-1/2 cups all-purpose flour, spooned into measuring cup and leveled off with a knife
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1 teaspoon baking soda
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3/4 teaspoon ground cardamom
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3/4 teaspoon cinnamon
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1/4 teaspoon ground ginger
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1/4 teaspoon allspice
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3/4 teaspoon salt
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1 cup mashed very ripe bananas, from 2-3 bananas
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1/2 cup sour cream
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1 teaspoon vanilla
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1/2 cup chopped walnuts (optional)