First step is Preheat the oven to 400ºF. Wash the sweet potatoes, pat them dry, and prick their skins a few times with a fork. Slice the sweet potatoes in half lengthwise, then place them on a baking sheet. Drizzle the cooking oil over the potatoes, then use your hands to smear the oil over their entire surface (skin and cut sides), leaving a liberal amount of oil on the baking sheet under the potatoes to keep them from sticking.
And then, Place the sweet potatoes with the cut side up, then sprinkle with cinnamon, a pinch of cayenne pepper, and a pinch of salt. Flip the sweet potatoes over so they are cut side down, then roast for 45-50 minutes, or until they are soft all the way through and the juices are caramelized and bubbling out of the holes in the skin.
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