Cook chicken, cut it, or dice it, or shred it. Heat the oleo in skillet, saute onions, celery, and mushrooms till tender. Mix together soups, cheese, and chicken broth. Cook this on top of the stove over low heat, until cheese is melted . Add the sauteed veggies to soup and cheese mixture. Boil spaghetti till tender. Drain, add the soup and veggie mixture. Pour this in to a large baking dish, sprayed with Pam cooking spray. Bake @350* for 35-45 minutes. I also add black pepper to taste. You can also cover this while baking.