Bake the sweet potatoes in the oven at 220 degrees for 30 minutes.

Preparation materials: sweet potatoes: 3 pieces, water: appropriate amount.

1. Rinse the sweet potatoes.

2. Add water and put it into the pot.

3. Cover and cook for 15 minutes.

4. Wrap it in tin foil after taking it out of the pot.

5. Bake in the oven at 220 degrees for 30 minutes.

6. After 30 minutes, the sweet potatoes will be ready to eat.