This next-level grilled cheese is perfect for adults looking for a hit of nostalgia updated with grown-up flavors. Switch out the jam and cheese to make it your own, mixing and matching flavors to your heart’s content. Try stuffing sandwiches with whole-grain mustard and Comté cheese with June’s Caramelized Onions, or a smear of June’s Pesto with provolone and some shredded roast chicken. Using mayonnaise on the outside helps the sandwich brown while adding a nice savory flavor, but use butter if you prefer.