INGREDIENTS
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Cookies
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1 3/4 cups all-purpose flour
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1/2 teaspoon baking powder
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1/4 teaspoon salt
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1/2 cup (1 stick) unsalted butter, at room temperature
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3/4 cup granulated sugar
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1 egg plus 1 egg yolk
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1 teaspoon vanilla extract
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Royal Icing
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3 cups confectioners' sugar
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2 tablespoons powdered egg whites (see Note)
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Sparkling sugar