In a small, shallow baking dish, mix together the liquid aminos, brown sugar, black pepper, garlic powder and lime juice.
Slice the Cosmic Crisp® apples through the center about ½-inch thick. Using a fork, prick the apple slices in several places and place them in the marinade. Let sit in the refrigerator for 2-4 hours.
Heat a grill or grill pan to medium-high. Place the Cosmic Crisp® apple slices on the grill. Grill each side for 3-4 minutes until the apples are caramelized and tender, but not soft. Lay the slices of cheese on top. Cover and let the cheese melt, about 1-2 minutes.
Serve immediately on toasted burger buns.
Try it with Cosmic Crisp® Apple Relish!