In a medium bowl, whisk together olive oil, lemon juice, minced garlic, chopped rosemary, chopped thyme, salt, and pepper.
Place chicken breasts in a resealable plastic bag or shallow dish. Pour the marinade over the chicken, ensuring it's well coated. Marinate in the refrigerator for at least 30 minutes, or up to 2 hours.
Preheat your grill to medium-high heat.
Remove chicken from marinade and discard the marinade. Grill chicken for 6-8 minutes per side, or until cooked through and internal temperature reaches 165°F (74°C).
Let the chicken rest for 5 minutes before slicing and serving.
Notes
Serve with a fresh salad or grilled vegetables for a complete meal.