Separate beef into 4 equal portions. Use hands to lightly form into patties the size of your buns. Once you have formed the patties, season generously with a blend of salt and pepper on both sides.
Take your oil and apply it to your skillet or flat top, sauté your onions until caramelized, and then remove.
Now that you have a hot cooking surface, add the patties and cook for 3 minutes until you get a good sear. Do not press the patties. After 3 minutes, gently flip the patties and the cover with cheese. While you wait, lightly toast your buns.
To serve: Spread base of buns with Thousand Island sauce/condiment of choice. Pile over sautéed caramelized onions, then more Thousand Island sauce. Top with a lid of bun. Serve immediately.