INGREDIENTS
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1 cup unsalted butter
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1 cup granulated sugar
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1 tablespoon whole milk
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1 teaspoon lemon zest
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1 teaspoon vanilla extract
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1 large egg
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2 3/4 cups all-purpose flour, plus more for dusting
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1 teaspoon baking powder
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1/4 teaspoon kosher salt
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icing
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red and green sprinkles
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milk, for serving