1. Preheat oven to 350 degrees Fahrenheit.
2. Rinse and pat chicken dry inside and out. Place orange, garlic cloves (if using) and cinnamon stick inside the cavity of the chicken. Tie legs and wings for nice presentation. Place breast-side down in a nine- by 13-inch roasting pan. (If you use a disposable pan, double it for stability as the chicken will release liquid and it will be difficult to remove it safely from the oven.) Rub chicken with oil and sprinkle with salt and pepper.
3. Roast chicken 45 minutes and remove from oven. Turn chicken over using two wooden spoons or spatulas. Return to oven and roast 45 minutes longer.