Place chicken breasts on the bottom of the slow cooker.
Cover chicken with slices of Swiss cheese.
In a small bowl, combine cream of chicken soup and milk and pour over chicken and cheese.
Sprinkle stuffing mix on top and drizzle butter over the top.
Cover and cook on low for 4-6 hours or high for 2-3 hours.
Notes
To make this recipe in the oven:Preheat oven to 350 degrees. Place chicken in a 9×13″ baking dish. Top with Swiss cheese slices.In a bowl, mix together milk and cream of chicken soup. Pour over chicken breasts, then top with dry stuffing mix. Drizzle butter over the stuffing mix.Cover with foil and bake for 50 minutes, or until chicken is cooked through.