Wash and scrub. Run the sweet potato under water and scrub it well to remove any dirt or residue. You are eating the skin, so give it a good clean.
Poke holes all over. Use a fork (or a sharp knife) to poke holes into all sides of the potato.
Wrap it up. Wet a paper towel, wring it out so it's damp but not dripping, and wrap it snugly around the potato. Set the wrapped potato on a microwave-safe plate.
Microwave and flip halfway. Microwave on high power for half the time required to cook your potato based on the size / weight. Flip the wrapped potato with a tongs or oven mitt, and continue to cook for the additional time required.*See the timing guide below for how long to cook based on size.*
Check for doneness. The potato is ready when a fork slides easily into the center without much resistance. If it still feels firm, keep going in 30 second increments and check again.
Notes
Potato cooking time guide: Note that the size, shape, and your microwave wattage will all affect the cooking time required, so treat these as a starting point and check for doneness before you pull it out. A short, thick potato will take longer to cook through the middle than a long, skinny one of the same weight.
Small sweet potato (about 6 to 8 ounces): about 3 minutes, flip, then 2 more minutes
Medium sweet potato (about 9 to 12 ounces): about 3 minutes, flip, then 3 more minutes
Large sweet potato (about 13 to 16 ounces): about 4 minutes, flip, then 4 more minutes
Cooking two at a time? You'll need to add an additional 1 to 4 minutes to the cook time. Check to see if they've reached fork-tender, continuing to cook in 1 minute increments until a fork slides in easily.Storage: Let the potatoes cool completely, then store them whole or scooped into an airtight container in the refrigerator for up to 4 days. Detailed freezer notes above in the blog post if needed.