INGREDIENTS
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3 cups all purpose flour
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1 teaspoon baking powder
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1/2 teaspoon salt
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1 cup (2 sticks) unsalted butter, room temperature
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1 cup sugar
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1 large egg
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2 tablespoons sour cream
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1 teaspoon vanilla extract
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Additional sugar
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4 cups (or more) sifted powdered sugar (sifted, then measured)
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3 tablespoons (or more) whole milk
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1/2 teaspoon vanilla extract
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Colored sugar crystals, sprinkles, and/or decors
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Food-safe colored markers (such as FooDoodler pens; see note*)