Follow these simple steps to create the most delicious Herb Butter Roasted Chicken:

1. Preheat the Oven: Preheat your oven to 425°F (220°C).

2. Prepare the Herb Butter: In a medium bowl, combine the softened butter, chopped rosemary, thyme, parsley, minced garlic, lemon zest, salt, and pepper. Mix until well combined.

3. Prepare the Chicken: Pat the chicken dry with paper towels to ensure crispy skin. Season the inside and outside of the chicken generously with salt and pepper.

4. Stuff the Chicken: Stuff the cavity of the chicken with the quartered onion and additional fresh herbs for enhanced flavor.

5. Apply the Herb Butter: Gently separate the skin from the chicken breast. Using your fingers, spread some herb butter directly under the skin. Rub the remaining herb butter all over the chicken skin.

6. Truss the Chicken (Optional): If desired, tie the legs together with kitchen twine to ensure even cooking.

7. Roast the Chicken: Place the chicken breast-side up in a roasting pan. Roast in the preheated oven for about 1 hour to 1 hour 15 minutes or until the internal temperature reaches 165°F (75°C).

8. Check for Doneness: Baste the chicken halfway through roasting for extra moisture. If the skin is browning too quickly, cover with aluminum foil.

9. Rest the Chicken: Once cooked, remove the chicken from the oven and let it rest for 10-15 minutes before carving. This allows the juices to redistribute for a juicier meat.

10. Carve and Serve: Carve the chicken and serve it warm, drizzled with any pan juices.