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Grilled cheese sandwiches need little improvement. From the basic Wonder bread and American cheese combo to ritzier versions, the combination of buttery, toasted-until-golden bread gushing with warm melted cheese is synonymous with comfort.
Nevertheless, adding a few bells and whistles to the classic never hurt. This grilled cheese is slathered in butter for that crisp exterior that's a must for these sandwiches, while the inside is generously layered with soft, mildly pungent taleggio cheese. Tucked in the middle are mixed mushrooms sautéed with herbs and sweet shallots.
The trick to perfect grilled cheese sandwiches is to cook them over moderate heat so the bread toasts to a perfect bronze and the cheese melts thoroughly; there's nothing worse than a grilled cheese that looks good on the outside, only to reveal cheese that it's barely warmed through. Take it from an impatient person: your time is worth it here.