Corned Beef Casserole

1 8 oz. package noodles
12 oz. can corned beef, diced
1/4 lb. American cheese, diced
3/4 cup buttered crumbs
1 can condensed cream of celery soup
1 cup milk
1/2 cup chopped onion

Cook noodles in boiling, salted water until tender; drain. Add corned beef, cheese, soup, milk and onion. Pour into greased 2-quart casserole. Top with buttered crumbs. Bake in moderate oven (350°F.) 45 minutes. Serves 8 to 10.