In a skillet saute onion and celery in butter or margarine Stir in tuna or chicken soup mayonnaise milk and mushrooms Meanwhile cook noodles according to package directions drain In a 2-quart greased casserole combine noodles and tuna mixture Top with bread crumbs with melted butter or margarine
Add Mozzarella cheese
Bake at 350 for 25 to 30 minutes or until lightly browned and bubbly