"In 'Simply Sensational Cookies' by Nancy Baggett..."
INGREDIENTS
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14 tablespoons unsalted butter, cut into chunks, softened
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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 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 chips (or a combination) or 1 cup peanut butter chips (or a combination)