01 - Set the oven temperature to 425°F.
02 - Pat the chicken dry thoroughly with paper towels and place it on a rack inside a roasting pan.
03 - Rub olive oil evenly over the exterior and interior of the chicken. Sprinkle kosher salt and freshly ground black pepper all over.
04 - Fill the cavity with halved garlic, lemon, onion quarters, thyme leaves, and chopped rosemary.
05 - Tie the legs together using kitchen twine and tuck the wing tips underneath the body to ensure even roasting.
06 - Place the chicken in the oven and roast for 75 to 80 minutes, or until the internal temperature in the thickest part of the thigh reaches 165°F and the juices run clear.
07 - Remove from oven and let rest for 10 to 15 minutes before carving to retain juices.
08 - Optionally sprinkle with freshly chopped parsley and serve warm.