The barbecue function of this microwave oven is not good for sweet potatoes. I have tried many times, but nothing is good. Finally, wrap the sweet potato with fresh-keeping substitutes and poke a few small holes, which is well ventilated. Use high heat for ten minutes, remove the substitute and continue for two minutes. When you are ready, eat it. It tastes good. Remember that sweet potatoes don't need to be big, they grow better. )