INGREDIENTS
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3 1/2 cups flour
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1 1/2 teaspoons baking soda
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1/4 teaspoon salt
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3/4 cup sugar
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1 cup unsalted butter, at room temperature
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1 egg
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1/2 cup sour cream
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1 teaspoon vanilla
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Frosting
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1/2 cup unsalted butter, at room temperature
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2 cups powdered sugar
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2 tablespoons milk