INGREDIENTS
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2 cups all-purpose flour, plus more for dusting
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2 teaspoons baking powder
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1/2 teaspoon fine salt
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1/2 cup (1 stick) unsalted butter
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1 cup granulated sugar
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1 large egg
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1/2 teaspoon vanilla extract
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One 1-pound box confectioners' sugar
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3 tablespoons meringue powder
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1/3 cup warm (80 to 90 degrees F) water
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Food coloring, optional
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Assorted sprinkles, colored sugar and small candy pieces