2 pounds ground beef
1 cup soft bread crumbs
1/2 cup chopped onion
1 egg
Salt and pepper

Have ready 8 tomato slices and 8 hamburger buns. Combine meat, bread crumbs, onion, egg, salt and pepper. Mix lightly. Place meat mixture on a cookie sheet (with an edge so it doesn't spill over). Press to within 1 inch of edge of pan. Bake at 350 degrees F for 20 minutes. Drain excess fat. Top with 8 cheese slices and tomato slices. Bake until cheese melts. Cut into squares.

Serve on buns.