Green Bean Casserole

2 boxes frozen French style green beans (thawed)
1 med. onion, chopped
Butter
1 c. sliced water chestnuts
1 c. shredded cheese
1 can mushroom soup
1 can French fried onion rings

Sauté onions in butter. Layer in a greased casserole:
Beans , Onions, Water chestnuts, Cheese, Mushroom soup. Repeat layers Bake 25 minutes at 350 degrees or until heated through. Add onion rings the last 5 minutes. Serves 6. 

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