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

Place the chicken breasts in a large resealable bag and pour the marinade over the chicken.

Seal the bag and refrigerate for at least 30 minutes, or up to 4 hours for more flavor.

Preheat the grill to medium-high heat.

Remove the chicken from the marinade and discard the marinade.

Grill the chicken for 6-7 minutes on each side, or until the internal temperature reaches 165°F (75°C).

Let the chicken rest for 5 minutes before slicing.