Pre heat oven to 400°F

Combine beef, salt, bread crumbs, onion

Gently press into bottom of 9x13 until you have a single even patty. poke with fork

Bake for 30 min, or until fully cooked.

Drain grease from around patty.

Place cheese slices on patty and put back into oven for a couple of minutes

Remove from oven and let rest for about 5 minutes. Then cut patty into slices the size of the rolls