2 cans French style green beans
1 can cream of mushroom soup
1 can onion rings

Butter a casserole dish. Drain green beans. Mix with mushroom soup. Place in dish. Mix 1/2 can onion rings throughout. Sprinkle remaining 1/2 on top. Bake at 350 degrees for 15-20 minutes (covered). Uncover and cook until bubbly.