Layer the following in a large pan. Use quantities to suit your family size.

Sliced zucchini
Browned, drained hamburger
Thinly sliced onion
Instant rice
Chopped green pepper
Shredded cheese
Chopped tomato

Spoon over this 1 can cream of mushroom soup, sprinkle with bread crumbs. Bake at 350 degrees for 1 hour.