Place turkey on a wire rack in a roasting pan. Dry skin of turkey with a paper towel. Rub half of butter over the top of each of the breasts. Season well with salt and pepper.
Roast for 1 hour at 375° or until internal temperature reads 165° on a meat thermometer. (Cover with foil if getting too brown towards the end of the roasting time.) Cover with foil and allow to rest for 20 minutes before slicing.
If making ahead of time, slice and pour drippings over the turkey and cover tightly. Reheat in a 350° oven for 20 minutes.