Preheat your oven to 425°F.
Prepare a baking sheet lined with parchment paper or aluminum foil to prevent sticking.
Wash and scrub the purple yams thoroughly, leaving the skin on if you prefer a rustic texture. Trim both ends by holding the sweet potato firmly and slice off a thin layer from each end (about ¼ inch).
Dry the purple yam on a flat surface. Add the olive oil, sea salt, black pepper, and any additional spices you like. (You can also cut the yams into wedges or cubes for even cooking.) Toss the yams well, ensuring each piece is evenly coated with oil and seasoning.
Spread the yams in a single layer on the prepared baking sheet, leaving enough space between each piece for even roasting.
Roast the yam for 15 minutes per side or until the yams are tender and the edges are golden brown. You can flip the pieces halfway through the cooking time for extra crispiness. Garnish and serve. Enjoy!