INGREDIENTS
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½ cup butter or margarine, softened
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½ cup shortening
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½ cup white sugar
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½ cup confectioners' sugar
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1 egg
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2¼ cups all-purpose flour or whole-wheat pastry flour
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½ teaspoon baking soda
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½ teaspoon salt
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1½ teaspoons vanilla extract
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½ teaspoon cream of tartar
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frosting or sprinkles, optional