1 lb. hamburger
1 sm. onion
1 can green beans, drained
1 can cream of mushroom soup
1/2 can water or milk
1 (2 lb.) pkg. tater tots

Brown hamburger and onion; drain. Layer in 9 x 13 pan as follows: hamburger, beans, tater tots. Mix soup with water or milk. Pour over casserole. Bake at 350 degrees for 1 hour.