INGREDIENTS
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1 2/3 cups all-purpose flour
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1/4 cup plus 2 tablespoons packed light brown sugar
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3/4 teaspoon cinnamon
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1 tablespoon baking powder
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3/4 teaspoon baking soda
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1/2 teaspoon salt
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1 1/3 cups plus 2 tablespoons old-fashioned rolled oats
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1 1/2 sticks (3/4 cup) cold unsalted butter, cut into tablespoon pieces
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2/3 cup well-shaken buttermilk plus additional for brushing