INGREDIENTS
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1/2 cup butter, softened
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1 cup packed brown sugar
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1 large egg
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1 teaspoon vanilla extract
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1 + 1/2 cups quick-cooking oats
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1 cup all-purpose flour
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1/2 teaspoon ground cinnamon
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1/2 teaspoon salt
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1/2 teaspoon baking soda
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1/4 teaspoon baking powder
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3/4 cup white chocolate chips, plus more for tops
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3/4 cup fresh blueberries