INGREDIENTS
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1½ cups flour
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½ cup sugar
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1½ teaspoons baking powder
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½ teaspoon salt
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½ cup (1 stick) unsalted butter, at room temperature
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½ cup sour cream
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1 egg plus 2 egg yolks at room temperature
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1 tsp. vanilla
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½ cup (5 ounces) cotton candy, packed