Lightly coat the roasting pan with vegetable spray.
Make the Vegetables: Toss all of the ingredients in a large bowl, and arrange them in the roasting pan, leaving room in the center for the chicken.
Prepare the Chicken: Nestle the chicken pieces in the center of the pan. Combine the remaining ingredients and sprinkle evenly over the chicken. Cover the pan tightly with aluminum foil and bake for 1 hour.
Remove the chicken from the oven and baste with the drippings. Continue baking uncovered until well browned, about 1 hour more. Arrange the chicken on a platter surrounded by the vegetables. Sprinkle with the garnish.