INGREDIENTS
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1/2 cup (1 stick) plus 4 tablespoons unsalted butter, room temperature
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1 cup old-fashioned oatmeal
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1 cup plus 2 tablespoons all-purpose flour
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1 teaspoon baking soda
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1 teaspoon salt
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1/3 cup granulated sugar
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1/2 cup packed dark-brown sugar
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1/2 cup peanut butter
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Turbanado sugar, for sprinkling
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Peanut Butter Filling