Remove your whole chicken from the fridge about 30 minutes before roasting. This brings it to room temperature, which helps it cook more evenly. Pat the chicken dry with paper towels. Drying the skin is key to achieving that perfectly crispy, golden-brown finish.
Drizzle olive oil (or melted butter) all over the chicken, making sure to cover every part. In a small bowl, mix together your kosher salt, black pepper, garlic powder, onion powder, smoked paprika, dried thyme, and rosemary. Rub this seasoning mixture all over the chicken—inside and out. Make sure you get under the skin if possible, as this will allow the flavors to really penetrate the meat.
Stuff the cavity of the chicken with the halved lemon, garlic, and a bunch of fresh herbs. This adds incredible flavor from the inside out while keeping the meat juicy.
In your roasting pan, place the quartered onions, carrots, and celery chunks. These veggies will act as a bed for your chicken, absorbing all those rich drippings as it cooks. They’ll come out tender and full of flavor, making a great side dish to serve alongside the chicken.
For even cooking, consider trussing your chicken by tying the legs together with kitchen twine. This step isn’t essential, but it helps the chicken cook evenly and looks great for presentation.
Preheat your oven to 425°F (220°C). Place the chicken, breast-side up, on top of the vegetables in your roasting pan. Roast the chicken at 425°F for 20 minutes. Then reduce the oven temperature to 375°F (190°C) and continue roasting for 1 to 1.5 hours, depending on the size of your bird. The internal temperature should read 165°F (74°C) when checked in the thickest part of the thigh (without touching the bone). If the skin is browning too quickly, loosely tent the chicken with aluminum foil.
Once done, remove the chicken from the oven and let it rest for 15-20 minutes before carving. This allows the juices to redistribute, making the meat tender and juicy.
Use a sharp knife to carve your chicken. Start by removing the legs and thighs, followed by the wings, and then slice the breasts. Serve alongside the roasted vegetables from the pan.