INGREDIENTS
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1 1/2 cups all-purpose flour
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1/2 cup unsweetened cocoa powder
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2 teaspoons baking powder
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1/4 teaspoon salt
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1 egg
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3/4 cups granulated sugar
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3 tablespoons vegetable oil
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1/4 cup sour cream
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1 teaspoon vanilla extract
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1/2 cup milk
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2 tablespoons whole milk
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1 teaspoon vanilla extract
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1 1/2 cups powdered sugar