Preheat the oven to 425ºF.
Cut the tip off the head of garlic, exposing the very top of the cloves. Drizzle the top of the garlic head with EVOO, wrap it tightly in tin foil. Place the garlic head in the oven and let it roast for approximately 45 minutes. When the garlic is finished and cool enough to handle, squeeze the cloves out of their skins and into a small bowl. Mash it with a fork.
Arrange the chicken pieces in a roasting pan, drizzle them with EVOO and season them with grill seasoning. Roast the pieces in the oven alongside the garlic, until they reach an internal temperature of 165ºF, about 35 minutes.