INGREDIENTS
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1/2 cup butter, room temperature
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3/4 cup sugar
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1 egg
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2 teaspoons vanilla
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2 cups flour
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2 teaspoons baking powder
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1 teaspoon kosher salt
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1/2 cup buttermilk
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2 cups fresh or frozen blueberries
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1/2 cup powdered sugar
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1 tablespoon milk, more as needed