INGREDIENTS
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2 1/2 cups all-purpose flour
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1/2 teaspoon baking powder
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1/2 teaspoon salt
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1/2 cup butter, softened
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1 cup granulated sugar
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1 large egg
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1 heaping Tablespoon sour cream
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1 teaspoon vanilla extract
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1/2 cup butter, softened
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4 cups powdered sugar
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1/4 cup milk
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1 teaspoon vanilla
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1/4 teaspoon salt
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Food coloring