how long to cook a sweet potato in a microwave
1 If you prefer crispy skinned sweet potatoes, you can cook the potatoes in the microwave for 5-6 minutes, then unwrap your sweep potato and transfer it to a baking sheet and bake in an oven preheated to 400 Â°F (204 Â°C) for 20 minutes. Try putting the potato in for 5 minutes to begin with, then take it out and turn it over so that both sides cook evenly. 2  Place it back in the microwave for another 3-5 minutes, depending on how soft it is already.