Chicken Casserole

In a large skillet, saute the celery, onion and green pepper in butter. Remove from the heat; stir in the chicken, mushrooms, olives, soup, milk and noodles. , Transfer to a 2-qt. baking dish. Cover and bake at 325° for 25 minutes. Meanwhile, combine topping ingredients. Sprinkle around edge of casserole; bake 5 minutes longer or until cheese is melted.