INGREDIENTS
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14 tablespoons cold unsalted butter, cut into chunks (2 tablespoons shy of 1 cup)
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1 cup packed dark brown sugar
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1 large egg, at room temperature
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2-1/2 teaspoons pure vanilla extract
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1/2 teaspoon salt
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1/4 teaspoon baking soda
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2 cups unbleached all-purpose flour
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1 cup butterscotch or peanut butter chips, or a combination