1, prepare bananas, (don't choose the ones that are too ripe to turn green, choose the ones that are yellow but not soft).
2. Remove the banana peel.
3. Slice with a fruit knife.
4. Put it on a baking tray and pad it with oiled paper.
5. Put it into the oven and turn on the function of the air oven.
6. Bake 1 half hour. You need to take it out and turn it over in the middle.
7. Bake until the water is dry.