Place the chicken breasts on a cutting board or plate, and pierce them with a fork all over. Season with salt and pepper.
Pour the salad dressing into a bowl or zipper bag and add the chicken breasts.
Make sure the chicken breasts are well covered in the marinade, and marinate for at least one hour overnight in the fridge.
Preheat the oven to 350 F and lightly grease a 9x13-inch baking dish.
Remove the chicken breasts from the marinade and shake off the excess.
Place the chicken breasts on the baking dish, cover with foil, and cook for 50-60 mins or until fully cooked, the internal temperature of the beasts reaches 165 F, or when pierced, the juices run clear. 10 minutes before the cooking time is over, remove the foil so the chicken browns nicely.