2. Introduction to practice. Ingredients: 8 sweet potatoes. Steps: Wash and dry the sweet potato, preheat it in the microwave oven, then put the washed and dried sweet potato in, and adjust the temperature at 200 degrees Celsius for 20 minutes. Finally, you can take it out and enjoy the food. During baking, it is necessary to observe sweet potatoes occasionally. If it is small, the time should be adjusted smaller.