Preheat oven to 350.
Place 4 chicken breasts in greased glass dish. Cover with lots of swiss cheese. On top of that, pour 1 can cream of mushroom soup mixed with 1/4 c. milk. Top with 1 c. of Italian flavored bread crumbs (or stuffing - crushed), pour 1/4 c. melted butter on top. Bake for 50-55 minutes.