Preheat oven to 350 degrees. Generously spray or grease a 9 X 11 casserole.
Prepare cornbread and crumble in a large bowl.
Melt butter in a skillet and sauté onions, celery. and oysters until vegetables are translucent and oysters are cooked through, about 8 minutes. In a small bowl, whisk eggs.
Add eggs, onions, celery, oysters, broth, white bread, poultry or Creole seasoning, mushroom soup, salt and pepper to the cornbread. Mix thoroughly and spoon into prepared casserole. Place in pre-heated oven for 35 - 40 minutes or until golden.