INGREDIENTS
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¼ cup unsalted butter, softened
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¾ cup white sugar
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1 egg
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½ cup sour cream
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Zest from 1 lemon
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1 tablespoon lemon juice
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2 cups flour
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1 teaspoon baking powder
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½ teaspoon baking soda
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Pinch salt
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1 cup frozen blueberries
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¼ cup milk