Microwaving a sweet potato won’t crisp up the skin. But, if you really want crisp skin in a hurry, after microwaving the potato, you can air fry or broil it to get that desirable crisped texture. To do this, lightly coat the skin in oil and transfer the potato to an air fryer or place it under a hot broiler. Turn regularly and keep an eye on it as the high sugar level means sweet potatoes burn easily.