Mix all the herbs (except parsley), lemon juice, and olive oil in one bowl. Or combine them in a mason jar, shaking it vigorously.
In a separate bowl, place the chicken breast pieces and pour the herb mixture on the chicken.
Place the marinated chicken in a zip-lock bag and store the bag in the refrigerator for 2-5 hours.
Keep turning the bag to ensure each part of the chicken gets the marinade.
Meanwhile, preheat your grill over medium heat (to 425-450 degrees F)
Brush the grill lightly with olive oil. Place the marinated chicken on the grill and let it cook for at least 5 minutes.
Flip the chicken on the other side for even grilling. Grill it for another 5 minutes. (Use the instant-read thermometer to check the internal temperature- until the chicken registers 160-165 degrees F)
When your chicken turns crisp and golden brown, remove from the grill.
Let it rest for 5 minutes before cutting into it.
Place on a plate, sprinkle freshly chopped parsley, and serve hot.