Wash and dry the sweet potato. Don't peel it. Pierce it in a few places with a fork.
Place the potato on a paper towel and microwave it on high for 3 minutes. Turn it to the other side and microwave for 2 more minutes or until fork-tender (see the Notes section below).
Be careful when removing the sweet potato from the microwave - it will be hot. Allow it to rest for 2 minutes, then cut it in half.
If desired, sprinkle the potato with kosher salt and top it with butter. Serve immediately.
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Notes
Larger potatoes will need more time in the microwave. Start with 3 minutes per side. The potato should be easily pierced with a fork. If its middle is still hard, flip it again and add an extra minute. Check again and add more time as needed.
Microwave ovens vary. You will need to adjust the cooking time according to the results you get in your own kitchen. Start with the recommended time and add more as needed.
Toppings such as butter and salt are optional and were not included in the nutrition info.
I like to simply slice the cooked potato and enjoy its natural sweetness - I don't even sprinkle it with salt, as I find the saltiness detracts from its natural flavor.
There's no need to peel the potato. Wash it well and microwave it with the skin on. Sweet potato skin is edible, so it's up to you if you want to remove it before eating. I like to leave it on.
You can keep the leftovers in the fridge, in a sealed container, for 3-4 days. Reheat them gently, covered, in the microwave at 50% power.