In a mixing bowl, combine olive oil, lemon juice, rosemary, thyme, garlic, salt, and black pepper.

Whisk until well blended.

Place the chicken breasts in a large resealable bag or dish.

Pour the marinade over the chicken, ensuring it is well coated.

Seal the bag or cover the dish and refrigerate for at least 30 minutes, or up to 2 hours for more flavor.

Preheat the grill to medium-high heat.

Remove the chicken from the marinade and discard the marinade.

Place the chicken on the grill and cook for about 6-7 minutes per side, or until the internal temperature reaches 165°F (75°C).

Remove from the grill and let rest for 5 minutes before serving.