INGREDIENTS
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1 stick (4 ounces/113g) unsalted butter, room temperature
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1 2/3 cups all purpose flour, spoon and leveled
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1 teaspoon baking soda
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1/2 teaspoon fine salt
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1 cup sugar
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2 large eggs
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1 1/2 cups mashed overripe banana
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2 tablespoons sour cream
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1 teaspoon vanilla extract
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6 ounces bittersweet chocolate, chopped finely