INGREDIENTS
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1 1/2 cups all-purpose flour
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1 1/4 teaspoon baking powder
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1/4 teaspoon baking soda
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1/4 teaspoon salt
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1 1/2 sticks (12 tablespoons) butter, softened to room temperature
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1 cup granulated white sugar
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2 large eggs
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1 large egg yolk
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2 teaspoons pure vanilla extract
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1/2 cup buttermilk