INGREDIENTS
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2 ¼ cups all purpose flour, plus more as needed
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1 ¼ teaspoons baking powder
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¼ teaspoon salt
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1 cup unsalted butter, at room temperature
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¾ cup granulated sugar
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1 large egg, at room temperature
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½ teaspoon vanilla extract
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Icing
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4 cups confectioners' sugar
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2 large egg whites, lightly beaten
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2 Tablespoons lemon juice, plus more as needed
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