Preheat oven to 350 degrees F.
Lightly grease or spray a 9x13-inch baking dish.
In a large bowl, whisk together condensed soup and milk. Stir in cooked chicken and green beans.
Pour chicken mixture into prepared baking dish.
In a separate bowl, pour melted butter over dry stuffing mix. Gently stir until all of the stuffing mix is coated with butter. Sprinkle over chicken mixture. ( I press my down after I sprinkle it so it's married with the chicken mixture lol).
Cover baking dish with foil. Bake, covered, at 350 degrees F for 20-30 minutes. Remove foil and bake for an additional 10 min or until heated through and browned on top.