uncooked elbow macaroni • cubed cooked chicken • velveeta • onion, chopped • chopped celery • chopped greem pepper • (8 oz) sliced water chestnuts, drained • (10-3/4 oz) condensed cream mushroom soup, undiluted • (10-3/4 oz) condensed cream of chicken, undiluted • milk • (14-1/2 oz) chicken broth • butter, melted •