To cook one sweet potato in the microwave, prick the sweet potato all over with a fork, and heat it on high for five to 10 minutes until tender. Turn the sweet potato once during cooking. Cook two sweet potatoes on high for about 12 minutes in the microwave.
Once cooked, cut the sweet potato in half lengthwise, and top with butter, cheese and sour cream for a savory dish. For a sweeter dish, top the sweet potato with butter, brown sugar and cinnamon. The sweet potato is a healthy carbohydrate that contains vitamin A, vitamin C, beta carotene and fiber.