INGREDIENTS
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9 oz. (2 cups) unbleached all-purpose flour; more as needed
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1/2 tsp. baking powder
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1/2 tsp. table salt
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6 oz. (3/4 cup) unsalted butter, softened
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1 cup granulated sugar
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1 large egg, at room temperature
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1-1/2 tsp. pure vanilla paste or vanilla extract