how long to cook sweet potateos in oven
1 Place the sweet potatoes on a rimmed baking sheet lined with foil. 2  Bake until tender, about 45 minutes. 3  Make a slit in the top of each sweet potato. 4  Top with 1 tablespoon of butter and season with the salt and pepper. Place the sweet potatoes on a rimmed baking sheet lined with foil. 2  Bake until tender, about 45 minutes. 3  Make a slit in the top of each sweet potato. 4  Top with 1 tablespoon of butter and season with the salt and pepper.