INGREDIENTS
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2 cups all-purpose flour, spooned and leveled
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1 teaspoon baking powder
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1/2 teaspoon salt
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1/4 teaspoon baking soda
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8 tablespoons (1 stick) unsalted butter, room temperature
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1 1/2 cups sugar, plus more for sprinkling
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1 large egg
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1 teaspoon pure vanilla extract
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1/4 cup sour cream
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