1 can cream of mushroom soup
1/2 soup can evaporated milk (or sour cream)
3 (16 oz.) can French style green beans, drained
1 can French fried onion rings

Mix soup and milk (or sour cream) in large casserole; add green beans and mix well. Add salt and pepper to taste. Bake at 350 degrees for 30 minutes; sprinkle French fried onions over top. Bake 5 minutes longer.