Preheat the oven to 375°F and lightly grease a 9x13-inch baking dish.
Mix cream of chicken soup, sour cream, broth, garlic powder, salt, and pepper until smooth.
Stir the cooked chicken and frozen vegetables into the creamy sauce.
Spread the chicken mixture evenly in the prepared baking dish.
Mix stuffing mix with chicken broth and melted butter; let it absorb for a couple of minutes.
Spread the prepared stuffing evenly over the chicken mixture without pressing it down.
Bake uncovered for 30 to 35 minutes until hot and golden.
Cover loosely with foil if the stuffing browns too quickly before the center is hot.
Rest for 5 to 10 minutes before serving.
Serve warm with a little stuffing and chicken mixture in every portion.