Sprinkle salt and pepper evenly over chicken; set aside.
Combine seasoned crouton crumbs and Parmesan cheese in a large zip-top plastic bag. Whisk together egg whites and 2 tablespoons water in a shallow bowl.
Dip chicken in egg white mixture, and drain. Place 1 breast half in bag; seal and shake to coat. Remove to a lightly greased aluminum foil-lined baking sheet, and repeat with remaining chicken.
Bake at 450° for 20 minutes or until chicken is done. Top each breast half with 2 ham slices and 1 Swiss cheese slice. Bake 5 more minutes or until cheese melts. Serve with honey mustard dressing, if desired.
Prep: 20 min., Bake: 25 min.