Preheat your oven to 350°F (175°C).
In a large bowl, combine the shredded chicken, diced celery, and diced onion.
Add the chicken broth, poultry seasoning, salt, and pepper to the mixture.
Stir in the melted butter until well combined.
Add the cornbread stuffing mix and parsley to the bowl and mix gently.
Transfer the mixture to a greased 9x13 inch baking dish.
Cover the dish with aluminum foil and bake for 25 minutes.
Remove the foil and bake for an additional 10-15 minutes until golden brown.
Let cool for a few minutes before serving.