Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the shredded turkey, stuffing mix, turkey broth, cream of celery soup, mixed vegetables, garlic powder, black pepper, and salt.
Transfer the mixture into a greased 9x13 inch baking dish, spreading it evenly.
Sprinkle the shredded cheddar cheese evenly over the turkey and stuffing mixture.
Sprinkle breadcrumbs over the cheese layer.
Cover the baking dish with aluminum foil and bake for 25 minutes.
Remove the foil and bake for an additional 15-20 minutes, or until the top is golden brown.
Let it cool for 5-10 minutes before serving.