Remove the 1 whole whole chicken 3.5–4.5 lbs from the refrigerator 30–45 minutes before roasting to take the chill off. This helps it cook more evenly. Pat the 1 whole whole chicken 3.5–4.5 lbs completely dry inside and out with paper towels — this is the single most important step for crispy skin.

Preheat your oven to 425°F. If using a roasting pan with a rack, place the rack inside the pan.

In a small mixing bowl, mix the softened unsalted butter with the 2 minced cloves garlic 2 minced cloves, 1 tbsp fresh rosemary finely chopped, 1 tbsp fresh thyme leaves finely chopped, 1 tbsp fresh flat-leaf parsley finely chopped (if using), 1½ tsp kosher salt for the butter mixture, and ½ tsp black pepper freshly ground until well combined.

Gently loosen the skin over the 1 whole whole chicken 3.5–4.5 lbs breasts and thighs by sliding your fingers underneath, being careful not to tear it. Push about half of the herb 4 tbsp unsalted butter under the skin and spread it evenly. Rub the remaining unsalted butter all over the outside of the whole whole chicken 3.5–4.5 lbs.

Season the cavity generously with 1 tsp kosher salt for the butter mixture. Stuff the cavity with the 1 whole lemon halved halves (squeeze them slightly first), smashed 4 cloves garlic 2 minced cloves, and a few sprigs of fresh fresh thyme leaves finely chopped or 1 tbsp fresh rosemary finely chopped if you have extras.

Drizzle the 1 tbsp olive oil over the 1 small yellow onion quartered, 3 stalks celery cut into 2-inch pieces, and 3 whole carrots peeled pieces (if using) and scatter them in the bottom of the roasting pan. They act as a natural roasting rack and build flavor in the drippings. Place the 1 whole whole chicken 3.5–4.5 lbs breast-side up on top of the vegetables (or on the rack).

Tie the legs together with kitchen twine and tuck the wing tips under the body. This helps the 1 whole whole chicken 3.5–4.5 lbs cook evenly and keeps the shape tidy.

Roast the 1 whole whole chicken 3.5–4.5 lbs at 425°F for 15 minutes to get the skin browning, then reduce the heat to 400°F and continue roasting. Plan for about 15–17 minutes of total cook time per pound. A 4 lb whole whole chicken 3.5–4.5 lbs will take approximately 60–70 minutes total.

The 1 whole whole chicken 3.5–4.5 lbs is done when a meat thermometer inserted into the thickest part of the thigh (without touching bone) reads 165°F. The juices should run clear when you pierce the thigh. If the skin is browning too fast, tent loosely with aluminum foil.

Transfer the 1 whole whole chicken 3.5–4.5 lbs to a cutting board and let it rest, uncovered, for at least 10–15 minutes before carving. This allows the juices to redistribute — do not skip this step. The internal temperature will continue to rise a few degrees as it rests.

Carve the 1 whole whole chicken 3.5–4.5 lbs by first removing the legs and thighs, then the wings, and finally slicing the breast meat. Serve with the pan drippings spooned over the top, and the roasted vegetables on the side.