Heat the oven to 425°F and set a rack in the center. Line a baking sheet with parchment paper.
Scrub the sweet potatoes under running water to remove any dirt. Pat dry thoroughly. Trim any bad spots or roots but leave the skin otherwise intact.
Use a fork or sharp knife to poke 6–8 holes all around each sweet potato to allow steam to escape.
Place the potatoes on the prepared baking sheet. Bake uncovered for 40–60 minutes, depending on size, until a fork or knife slides easily into the center and the potatoes feel very soft when gently squeezed.
Remove from the oven and let cool a few minutes. Slice lengthwise, fluff with a fork, and serve warm with desired toppings.