INGREDIENTS
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1/2 cup (1 stick) unsalted butter, room temperature
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2 teaspoons finely grated lemon rind
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7/8 cup plus 1 tablespoon sugar, divided
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1 egg, room temperature
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1 teaspoon vanilla extract
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2 cups fresh blueberries
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2 cups all-purpose flour, divided
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2 teaspoons baking powder
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1 teaspoon coarse salt
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1/2 cup buttermilk