Place the chicken breasts in a large container with the oil, herbs, garlic, lemon zest and pepper, and marinate overnight.
Drain excess marinade and season with salt and pepper. Place the breasts on a medium-heat grill and cook for about 8-10 minutes. Flip the chicken, cooking it for another 8 minutes. Check doneness with a thermometer or by cutting a small slit in an inconspicuous place. Adjust seasoning.
Recipe courtesy of Italian Cooking & Living magazine. Click here to view more delicious Italian recipes!