In a medium bowl, mix the softened butter with minced garlic, rosemary, thyme, parsley, lemon zest, and a pinch of salt and pepper.
Remove the chicken from its packaging and pat it dry with paper towels.
Gently loosen the skin of the chicken over the breast and thighs. Take some of the herb butter mixture and spread it under the skin. Use the remaining herb butter to rub all over the outside of the chicken.
Inside the cavity of the chicken, place the quartered lemon and onion.
For even cooking, you can tie the chicken legs together with kitchen twine.
Place the chicken in a roasting pan. Pour the chicken broth around the chicken in the pan.
Place the roasting pan in the preheated oven and roast the chicken for about 75 minutes, or until the internal temperature reaches 165°F (74°C).
Once cooked, remove the chicken from the oven and let it rest for 15 minutes.