If you'd like to use sweet potatoes or yams instead, follow the same steps, but consider slicing the potatoes slightly thicker. Sweet potatoes cook faster than regular white potatoes and make become too soft if the slices are too thin. You'll also want to skip the parboiling step for the oven method and reduce the baking time by a couple of minutes. Just keep an eye on them. If they're crispy on the outside and fork-tender, they're done.