Preheat oven to 400°F (200°C). Wash and dry the sweet potatoes, then prick them a few times with a fork. Rub skins lightly with oil and sprinkle with salt.
Place on a lined baking sheet and roast 45–60 minutes, turning once halfway. Potatoes are done when a skewer or fork slides in easily and the flesh is soft.
Let rest 5 minutes, split open, fluff the flesh with a fork and add desired toppings—butter and a sprinkle of cinnamon, a drizzle of honey, or miso butter for umami.
Microwave a scrubbed potato on high for 6–8 minutes (turn halfway) until tender, then finish in a 400°F oven for 10–12 minutes to crisp the skin if desired.
Notes
Select potatoes that are similar in size so they bake evenly.
To get a more caramelized exterior, place potatoes directly on the oven rack for the last 10 minutes.
Leftovers can be reheated in the oven or pan-fried for crispy cubes.