Preheat the oven to 425° F.
To your 9x13 baking dish, transfer the chicken breast side up in the baking dish,
Dry the chicken well with paper towels, discard the giblets, and fold the wings under.
Add the onion, lemon, ½ garlic head, a small bunch of parsley, 2 sprigs of rosemary, and 6 sage leaves to the cavity.
Tie the legs together with kitchen twine.
Coat the whole chicken with avocado oil, salt, and pepper on top. Rub the chicken with clean hands until the chicken is fully coated all over.
Bake the chicken for 30 minutes.
Add the potatoes, butter, and chopped herbs around the chicken.
Place the chicken back into the oven.
After 5 minutes, toss the potatoes in the melted butter.
Bake for 30 minutes, then toss the potatoes again to coat them in the butter.
Bake for an additional 10-30 minutes, or until the internal temperature reaches 165°F in the thickest part of the thigh.
If it starts to get too brown, loosely cover it with aluminum foil on top.
If it is not brown enough, broil on high or at 500° F for 3-5 minutes.
Set the chicken on a cutting board to rest for 15 minutes.
Place the potatoes back into the oven for 15 minutes while the chicken is resting.
Top the turkey with fresh thyme. I like to add the other herbs to the potatoes before serving.