Preheat your oven to 350°F (175°C).
- Grease a 9×13-inch baking dish with butter or non-stick spray.
- In a large bowl, mix together the cream of chicken soup, sour cream, chicken broth, garlic powder, onion powder, and black pepper until well combined.
- Stir in the shredded chicken and mix until evenly coated.
- Prepare the stuffing mix according to the package instructions. Most boxed stuffing mixes require boiling water and butter, then letting the mixture sit for a few minutes to absorb the liquid.
- Once the stuffing is ready, spread it evenly over the chicken mixture in the baking dish.
- Optional: Sprinkle shredded cheddar cheese over the top of the stuffing for added flavor and a melty topping.
- Bake in the preheated oven for 30-35 minutes, or until the casserole is bubbly and the top is golden brown.
- Let the casserole cool for a few minutes before serving.