Preheat your oven to 350°F (175°C).
In a large bowl, combine the cooked chicken, stuffing mix, celery, and onion.
In another bowl, mix the chicken broth, cream of chicken soup, milk, garlic powder, and paprika.
Pour the wet mixture over the chicken mixture and stir until well combined.
Season with salt and pepper to taste.
Transfer the mixture to a greased 9x13 inch baking dish.
Spread it evenly and press down gently.
Bake in the preheated oven for 30 minutes until golden brown.
Remove from the oven and let it cool for a few minutes.
Serve warm and enjoy.