Parboil 3 minutes each. Drain. Melt 8 ounces Cheez Whiz. Add 1 can cream of mushroom soup (or cream of celery or cream of chicken) and 1/2 can onion rings. Bake 3/4 hour at 350 degrees. Add 1/2 can onion rings last 10 minutes on top. Optional: Mushrooms may be added if desired. Can cover with lid or foil before last 10 minutes. Makes large casserole. I usually cut in half.