Preheat your oven to 425°F (220°C).
In a small bowl, mix together the olive oil, garlic powder, onion powder, thyme, rosemary, oregano, salt, and black pepper to create a herb paste.
Rub the herb paste all over the chicken, making sure to get under the skin for maximum flavor.
Stuff the cavity of the chicken with the halved lemon and smashed garlic cloves.
Place the chicken breast-side up in a roasting pan or cast-iron skillet.
Roast the chicken in the preheated oven for about 1 hour and 15 minutes, or until the internal temperature reaches 165°F (75°C) and the juices run clear.
Let the chicken rest for 10-15 minutes before carving.
Serve garnished with fresh herbs if desired.