American Cheese A salty, faintly sweet, and mild flavored American cheese is a fantastic option for grilled sandwiches. It has a creamy and smooth texture. Sandwiches with the American cheese filling can be served with tomato soup. Brie The best known French cheese, Brie works perfectly fine in a grilled cheese sandwich due to its richness and mild flavor. It has a soft and creamy interior, a buttery flavor and creamy texture. Fruit spreads, avocado, turkey, sauteed mushrooms, olive tapenade, pesto, and sliced apples pair well with Brie. Complementary Cheese Types To give a slightly different taste to the sandwiches, use two complementary cheese types for the filling. If you aren't sure which types work well together, ask an expert at a local gourmet cheese shop. For example, you may combine cheddar with a cheese having a smoother melting texture such as Comte, Gruyere, or Fontina. Fruity Fillings The savory flavors of cheese, bread, and butter can't be beaten but they can definitely be enhanced! When purchasing the cheese, ask which fruit complements it best. For instance, brie works well with apples and raspberries. Blackberries, strawberries, apples, and pears are among the good choices of fruit that can be used in grilled cheese sandwich fillings. Chicken Adding chicken along with golden raisins, slivered almonds, and chopped celery to the sandwich filling, makes it protein-rich and also adds an extra flavor to it. A combination of chicken, bacon, BBQ sauce, and cheddar cheese makes a grilled sandwich taste great. Beef Adding roasted beef and caramelized onions fills the sandwich with a sweet and earthy goodness. Fish Tilapia, a mild and flaky white fish can be added to a grilled cheese sandwich filling to make the sandwich more creamy and buttery. Cheddar, feta, or goat cheese may not work well with this fish. Salads Another good choice of the filling is a healthy and tasty salad. For example, you may use caprese, an Italian salad made using sliced fresh mozzarella, tomatoes, and basil (with salt and olive oil added). Salads made using zucchini, spinach and artichoke, French onion, steak and potatoes, tomatoes, and balsamic brussels sprouts are some other good options for sandwich fillings. It is best to cover the sandwich while cooking on the first side to melt the cheese sufficiently. The second side should brown faster. So remember to check it sooner than the other side.