Preheat oven to 350 degrees F (175 degrees C).
Arrange chicken in a greased 12 x 8 x 2 baking dish. Top with Swiss cheese slices.
Combine soup and milk and stir well.
Spoon mixture over chicken and sprinkle with stuffing mix.
Drizzle butter or margarine over crumbs.
Cover and bake at 350 degrees F (175 degrees C) for 50 minutes. Enjoy!