INGREDIENTS
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9 ounces all-purpose flour (2 cups)
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1/2 teaspoon salt
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1/4 teaspoon baking powder
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3/4 cup butter
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2/3 cup granulated sugar
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1 large egg
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1 1/2 teaspoons vanilla extract
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1 1/2 cups powdered sugar
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4 teaspoons egg white powder
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1/8 teaspoon salt
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2 tablespoons water
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Additional ingredient:
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Sparkling sugar (optional)