In a large mixing bowl, combine the ground beef, onion soup mix, coconut aminos, and egg with your hands until just combined.
Divide the beef mixture into 4 equal sized patties.
Place the burgers on the hot pan and cook for 3-4 minutes on each side, until the burger reaches the desired level of doneness. Top the burger with the cheese once it has been flipped.
Place the cooked burgers on the bottom half of the onion roll. Top with ¼ of the onions on each burger.