Sprinkle chicken with pepper. Place in an 8-in. square baking dish coated with cooking spray. In a small bowl, combine the onion, orange juice, soy sauce, oil, hoisin sauce, gingerroot, orange peel and garlic; pour over chicken.
Bake, uncovered, at 350° for 20-25 minutes or until chicken is no longer pink. Serve with rice if desired.