"So light, so citrusy...."
INGREDIENTS
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8 tablespoons (1 stick) unsalted butter
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1 large egg
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1/2 cup sour cream
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1 3/4 cups all-purpose flour
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1/2 teaspoon baking powder
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1/4 teaspoon baking soda
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1 medium lemon
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3/4 cup granulated sugar
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1/2 teaspoon kosher salt
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1/2 teaspoon lemon or vanilla extract
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2 tablespoons powdered sugar