Heat oven to 350°F. Lightly spray 11x7-inch glass baking dish with cooking spray. In small bowl, mix soup and milk until well blended. In another small bowl, mix stuffing crumbs and melted butter.
In baking dish, layer chicken, green beans, soup mixture and stuffing mixture.
Bake uncovered about 45 minutes or until chicken is no longer pink in center and mixture is hot and bubbly.