Put chicken breasts between sheets of plastic wrap and pound lightly to thin and then flatten to an even thickness.

Prepare the Marinade : Whisk the vinegar, soy sauce, olive oil, parsley, basil, oregano, garlic powder, and black pepper together in a bowl and pour into a resealable plastic bag.

Add chicken, coat with the marinade and seal the bag. Marinate in the refrigerator, at least 4 hours.

Lightly oil the grill pan and preheat before adding the marinated chicken

Grill chicken for 4 to 5 minutes per side.

To garnish, lightly sprinkle rosemary and thyme.