Sweet potatoes or yams
EVOO or any other oil you wish to use
salt and pepper to taste
This is more of a technique than a recipe. You can make as many as you want. Made this way, the vegetables stay nicely tender and moist, yet form a bit of a crust.
Peel and rinse the vegetables. Chop into bite size pieces. Steam in a steamer basket over water until just starting to get tender. Allow to cool so that you can handle comfortably. Turn out onto a foil lined baking sheet with some paper towels to bloat up any excess moisture. Remove the paper towels. Drizzle olive oil over the vegetables, sprinkle with salt and pepper, toss until vegetables are coated with oil (you should have minimal pooling of oil on the sheet pan) and salt and pepper are well distributed. Roast in a 400 F oven until vegetables are tender and starting to form a crisp crust, stirring occasionally, about 30 minutes usually.