You'll need one cooked chicken - diced. One quart chicken broth. Place in LARGE baking dish (I use a dutch oven). Now add: One bunch celery - diced. One large can of mushrooms. One quart of chopped tomatoes. One onion - diced. One cup of cream. One pound of grated cheese (I use cheddar - but you can use what you like). Now place uncooked spaghetti on top Cover tightly. Bake at 350 degrees for one and a half hours. Do not stir.