Preparation: Preheat your oven to 350°F (175°C). Use a cooking spray to lightly grease a 9-by-13-inch casserole dish.
Mix Main Ingredients: In a sizeable mixing bowl, combine the shredded chicken, cream of chicken soup, dried thyme, and milk. Once thoroughly mixed, transfer this mixture into the prepared casserole dish.
Topping: In a separate bowl, blend the melted butter with the dry stuffing mix. Ensure the stuffing is well-coated with butter. Sprinkle this over the chicken mixture in the casserole dish. For a crispy finishing touch, evenly distribute the canned fried onions on top.
Bake: Cover the casserole dish with aluminum foil and place it in the oven. Bake for about 20 minutes. After this, remove the foil and allow it to bake for an additional 10 minutes, or until you notice the top has turned a lovely golden brown.
Serve this casserole hot, and let the flavors transport you to a Thanksgiving dinner, anytime you wish!