Generously season chicken breasts on both sides with salt and pepper.
Add lemon juice, olive oil, rosemary, and thyme to a large ziplock bag. Add seasoned chicken. Seal well and refrigerate for at least 30 minutes, preferably 1-2 hours, and up to 8 hours or overnight.
When you're ready to grill, heat the grill to medium-high. Once the grill is hot, add the chicken and grill for 5-7 minutes on each side. Remove from grill and let rest on a plate for 5 minutes before serving.
Notes
You can easily double or triple this recipe if cooking for a larger group. Just make sure you don't crowd the chicken in the ziplock bags when marinating or when grilling.