Preheat oven to 375° F.

In a large bowl combine hamburger meat, onion, seasoning salt and pepper. Mix to combine. Press mixture evenly in the bottom of an un-greased 9x13 inch baking dish.

Bake, uncovered for 25 minutes or until meat is no longer pink in center. (It's normal for the meat to shrink a little)

Remove from oven and then carefully pour out the grease in the pan. Place cheese slices over the top of meat. Place back in oven for 2 minutes or until cheese is melted.

Cut meat into 12 equal size squares. Place each square of meat in the center of dinner roll. Serve with your favorite cheeseburger toppings! (Ketchup, mustard, pickles, etc)