Preheat oven to 425 degrees.
Trim of excess fat from chicken (found near neck and cavity) and remove any pin feathers that may be left behind.
Remove giblets from the center of chicken (discard or reserve for another use). Dab chicken well dry with paper towels
Rub a cast iron skillet with a little vegetable oil then transfer chicken to skillet, breast side facing upward.
Season inside cavity with salt and pepper then Stuff the garlic head into the chicken cavity along with the rosemary sprigs and the herbs.
Rub butter all over the chicken (focus especially on the upper breast side) and season all over with salt and pepper.
Tie chicken legs together with kitchen twine and fold the wing tips back and tuck under chicken.
Roast chicken in the preheated oven until thigh registers 165 and breast register 160, about 1 1/2 hours.
Broil until golden and crispy!
Transfer chicken to a carving board or platter (leave drippings in pan).