INGREDIENTS
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1 cup all-purpose flour
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1/4 teaspoon baking soda
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1/4 cup butter
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2/3 cup granulated sugar
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1/3 cup unsweetened cocoa powder
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1/4 cup packed brown sugar
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1/4 cup buttermilk or sour milk*
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1 teaspoon vanilla
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Nonstick cooking spray 1
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tablespoon sifted powdered sugar