Onion-Crusted Chicken..1 envelope Lipton onion soup mix, 1 c plain breadcrumbs, 2/3 c Hellman's mayonnaise, 8 boneless, skinless chicken breast halves..Preheat oven to 425. Combine onion soup mix with bread crumbs in shallow dish; set aside. Toss chicken with mayonnaise in medium bowl, then dip each coated breast in onion mixture, turning to coat on all sides. Arrange chicken on baking sheet. Bake 20 minutes or until chicken is thoroughly cooked.