01 - Set the oven to 425°F to prepare for roasting.
02 - Pat the chicken dry with paper towels. Rub all over with olive oil, sea salt, black pepper, and paprika if using.
03 - Fill the chicken’s cavity with half the onion, both lemon halves, the halved garlic bulb, and half the thyme and rosemary sprigs.
04 - Place the remaining onion, carrots, and celery evenly in a roasting pan. Position the chicken breast side up on top. Tuck the remaining herbs among the vegetables.
05 - Optional: Secure the chicken legs together with kitchen twine to promote even cooking.
06 - Roast uncovered at 425°F for 20 minutes to crisp the skin.
07 - Lower oven temperature to 375°F and roast for an additional hour or until the internal temperature of the thickest thigh reads 165°F and juices run clear.
08 - Remove the chicken and let it rest for 10 to 15 minutes before carving. Serve alongside the roasted vegetables with pan juices.