You cook baked sweet potatoes by washing whole tubers, piercing their skins with a fork, and roasting them at four hundred degrees for forty five to sixty minutes. Once the potatoes are fork tender, remove them from the oven and let them rest for a few minutes to cool down. Slice down the center of each potato and fluff the soft interior flesh with a fork before adding toppings. Enjoy your warm, perfectly cooked sweet potatoes as a healthy side dish.