Preheat the oven to 350°F. Grease a 9x13-inch baking dish or casserole dish with a little butter or cooking spray.
Dice your chicken into bite-sized pieces.
4 Large Chicken Breasts
In a bowl, combine cream of chicken soup, sour cream, milk, salt, and pepper. Stir until smooth. Note. If using the Dry Cream of Anything Soup Base, see the notes section.
½ Teaspoon Kosher Salt, ½ Teaspoon Black Pepper, 10.5 Ounces Cream of Chicken Soup, 10.5 Ounces Milk, ½ Cup Sour Cream
Layer the casserole. Spread the chicken evenly in your baking dish and pour the creamy sauce over the chicken mixture.
Prepare the stuffing topping. In a microwave-safe bowl, warm the chicken broth and butter until the butter melts. Stir in the stuffing mix until moistened, then spread evenly over the top of the chicken.