First thing you'll want to do is finely dice the white onions. You want them small and uniform. Then, combine beef with all the burger ingredients to a large bowl.
Stir the burger mixture until everything is combined.
Use your hands to form the mixture into 4 equal sized patties. Season each patty lightly with a pinch of salt and black pepper.
Add a slice of cheese to each burger 1 minute before removing from the pan. Then build your burger and enjoy!