In a large mixing bowl, combine the cooked squash, cornbread dressing, chopped onion, chopped celery, chicken broth, melted butter, salt, and black pepper. Mix well.
Transfer the mixture to a greased baking dish.
Bake in the preheated oven for 45 minutes, or until the top is golden brown and the casserole is heated through.
Let it cool for a few minutes before serving.
Notes:
This casserole is a great side dish for Thanksgiving or any family meal.