Preheat oven to 350° F. In medium fry pan, saute celery and onion in melted butter until tender, about 5 minutes. In large bowl, combine celery mixture with corn bread, broth, egg, poultry seasoning, salt and pepper. Toss lightly until bread is completely moistened. Place in well-greased or sprayed 1-1/2 quart casserole or 8-inch square baking dish. Cover with lid or aluminum foil. Bake 30 minutes. Remove cover and continue baking 15 to 20 minutes longer or until internal temperature reaches 160° F.