Creating the delicious Chicken and Stuffing Casserole is simple if you follow these easy steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Chicken: If you haven’t already, cook the chicken and shred or dice it into bite-sized pieces.
3. Sauté Vegetables: In a skillet, sauté the diced celery and onion over medium heat until they are softened, about 5 minutes.
4. Mix Ingredients: In a large bowl, combine the cooked chicken, cream of chicken soup, chicken broth, milk, sautéed vegetables, garlic powder, thyme, salt, and pepper. Mix until well combined.
5. Add Stuffing: Stir in the stuffing mix until everything is evenly distributed.
6. Transfer to Baking Dish: Pour the mixture into a greased 9×13-inch baking dish, spreading it evenly.
7. Top with Cheese: If desired, sprinkle shredded cheddar cheese on top for added flavor.
8. Bake: Place the baking dish in the preheated oven and bake for 35-40 minutes, or until the casserole is hot and bubbly, and the top is golden brown.
9. Cool Slightly: Once done, remove from the oven and let it cool for about 5 minutes before serving.

These straightforward steps will help you create a comforting Chicken and Stuffing Casserole that is sure to satisfy!