Wrap the washed potatoes with newspaper or craft paper (You can skip this process, but this is highly recommended to make the texture moist and gooey )
Wrap them over with foil
Bake them in the oven at 160℃ for 60-70 minutes (no pre-heating required)
Prick a chopstick through the potatoes. If it goes through smoothly, it's a "done" sign. If not, add another 5-10 minutes.
Cool them down until you can touch. Enjoy!