Trim the extra fat off the chicken breasts. Set the chicken on a plastic cutting board and cover it with a sheet of plastic wrap.
Use a meat mallet to pound the chicken breasts until they are approximately ½ - ¾ inch thick all over. You want the thickness to be uniform across all chicken breasts.
Add the olive oil, garlic, thyme, rosemary, oregano, salt, pepper and lemon zest to a gallon-size Ziplock bag and mix the ingredients together.
Place the chicken breasts into the Ziplock bag and rub the marinade over all parts of the breast. Refrigerate for four hours. (If you don’t have time, you can skip the marinating, and you’ll still have amazing chicken breasts.)
Preheat the grill to high. Once fully heated, Grab a silicone brush and brush olive oil on the grates. Be careful of any flare ups.
Place the chicken breasts on the grill and close the cover.
Cook for 3 minutes on one side then flip and cook for an additional 2-3 minutes or until a meat thermometer reaches 165 degrees. Do not overcook.
Remove the chicken and place it on a plate and allow to rest for 5 minutes before cutting and serving! Feel free to sprinkle fresh minced parsley over the chicken and serve with extra wedges of lemon.