In medium bowl, blend Hellmann's® or Best Foods® Real Mayonnaise, shallots, orange peel, rosemary, salt and pepper. Remove 1 tablespoon and reserve. Stir in spinach. Gently lift skin on chicken and evenly spread on mayonnaise mixture, then brush chicken with 1 tablespoon reserved mayonnaise mixture.
In shallow roasting or jelly-roll pan, arrange chicken. Roast 35 minutes or until chicken is thoroughly cooked. Garnish, if desired, with orange wedges and rosemary sprigs.