1 med. onion, chopped
2 cans English peas
1 can cream of mushroom soup
1 sm. can sliced water chestnuts
1 c. grated cheese
3/4 stick butter
1 c. crushed Ritz crackers

Mix together onion, peas, soup, and water chestnuts and put into casserole dish. Cover with grated cheese. Melt butter and add Ritz crackers. Top casserole with this mixture. Bake at 350 degrees for 20 minutes.