INGREDIENTS
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1 2/3 cups all purpose flour
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1 cup sugar
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1/4 tsp baking soda
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1 tsp baking powder
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3/4 cup butter, room temperature
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3 egg whites
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3 tsp vanilla extract
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1/2 cup sour cream
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1/2 cup milk
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Icing
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1/2 cup butter
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1/2 cup shortening
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4 cups powdered sugar
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2-3 tbsp water or cream
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1 tsp vanilla extract