INGREDIENTS
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8tablespoons(1 stick) unsalted butter, at room temperature, plus more for the pan
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2cupsold-fashioned rolled oats (not quick-cooking)
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1/2cupall-purpose flour, spooned and leveled
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1/2teaspoonbaking soda
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1/2teaspoonground cinnamon
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1/2teaspoonkosher salt
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1/2cuppacked light brown sugar
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1teaspoonpure vanilla extract
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1/2cupraisins
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1/2cupunsalted mixed nuts, such as walnuts and almonds, roughly chopped
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2ouncessemisweet chocolate, chopped