In a blender combine the parsley, thyme, sage, rosemary, oil, balsamic, salt and pepper. Blend together. Pour marinade over the chicken, cover and refrigerate for at least 2 hours or up to 48 hours.
Preheat grill to medium high heat, or set oven to broil. Grill or broil about 6 to 7 minutes per side, or until chicken is cooked through and no longer pink inside.
Serves 6