Cook spaghetti (not quite done). Boil and de-bone chicken, then cut into large bite sized pieces. Sauté onions, green pepper, garlic in butter. Add the soup, cheese and stock to onion mixture. Add chicken and olive. Grease casserole dish. Place rinsed spaghetti in dish and pour mixture over spaghetti. Bake 350ºF. for 30 minutes. Serves 10-12.