INGREDIENTS
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1 1/2 sticks (12 tablespoons) salted butter, softened
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3/4 cup granulated sugar
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1 large egg
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1 1/2 cups all-purpose flour
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3/4 teaspoon baking soda
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3/4 cup buttermilk
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Zest of 1 orange plus 2 tablespoons orange juice
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1 cup fresh blueberries
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1 cup confectioners' sugar