Roasting sweet potatoes at a high oven temperature makes the skin delicious and extra crackly.
Preheat oven to 475 degrees. With a fork, poke potatoes in several places. Arrange on a foil-lined baking sheet; bake until tender, about 40 minutes.
Cut a deep cross in the top of each potato, and push the ends together to make an opening. Sprinkle inside with salt and pepper; dot each potato with 1 tablespoon butter and 2 teaspoons sugar. Serve.