You can use your favorite burger recipe and just stuff the inside with cheese but I just followed this recipe where I got the idea from!
For one burger:
1/2 lb ground beef
1/2 tsp onion powder
1/4 tsp Worcestershire sauce
1/2 tsp seasoned meat tenderizer
1/3 tsp chili powder
2 slices of cheese
Season raw meat with onion powder, Worcestershire sauce, seasoned meat tenderizer, and chili powder. Separate the meat into two equal parts and make into patties.
Make a well in the center of one patty and tear one slice of cheese into eight pieces. Pile pieces of cheese into the well and fit the other patty over the cheese patty. Shape the patties together. Cook burger until done. Enjoy!