INGREDIENTS
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½ cup unsalted butter
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⅓ cup vegetable shortening
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2¾ cups all-purpose flour
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¾ cup sugar
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1 egg, beaten
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⅓ cup full fat sour cream
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1½ teaspoons baking powder
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Juice of 1 lemon
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2 large egg whites
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2 tsp fresh lemon juice
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3 cups powdered sugar
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food coloring (optional)