INGREDIENTS
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For cookies:
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4 cups cake flour
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1 tablespoon baking powder
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1 cup (2 sticks) butter, room temperature, plus more for greasing
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1 cup sugar
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2 large eggs
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1 teaspoon lemon extract
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For royal frosting:
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5 large egg whites
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1 teaspoon vanilla extract
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4 cups powdered sugar, sifted
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Black food coloring