1 lg. can whole kernel corn
1 lg. can French style green beans
1 c. celery soup
1 (8 oz.) box sour cream
1 can sliced water chestnuts (drained)
8 oz. grated cheese
1 sm. onion, minced (optional)

Drain beans and corn well and put in casserole dish. Combine remaining ingredients and pour on top. Crumble Ritz crackers on top and add 1/2 cup melted butter. Bake at 400 degrees for 40 minutes.