Place stuffing mix in large zipper seal bag and crush with a rolling pin or meat tenderizer (or your hands).In bowl or measuring cup, stir together soup and milk until well blended. Pour stuffing mix crumbs in one bowl and soup mixture into another.Dip each chicken breast, on both sides, first into soup mixture and then into crumbs. Place on greased baking sheet.Bake at 400 for 20-30 minutes, or until chicken is lightly browned and no longer pink in the center.