Swiss Chicken Casserole (Crockpot)

6 chicken breasts, boneless and skinless
6 slices Swiss cheese
1 can cream of mushroom soup
1/4 cup milk
2 cups stuffing mix
1/2 cup butter or margarine, melted

Lightly grease crockpot or spray with cooking spray. Place chicken breasts in pot. Top with cheese. Combine soup and milk, stirring well. Spoon over cheese; sprinkle with stuffing mix. Drizzle melted butter over stuffing mix. Cook on low 8 to 10 hours or high 4 to 6 hours. Serves 6.