Add to the bananas vegetable oil, salt, Cayenne pepper (if desired, you can dry onion, garlic). Mix everything carefully.
Cover the baking sheet with parchment paper (or a special Mat) put the bananas in a single layer put in a preheated oven (I have around 190-200 degrees) for a time that depends on the temperature and how toasted you want to see the chips. It is advisable to flip the chips at least once during cooking (but not necessarily), approximately bake the chips for 20-25 minutes, until they are crispy. Keep an eye on the chips, as they can burn (you can make them not very crispy), in General, the moisture should go away.
These banana chips can be made salted or without salt and then sprinkle with powdered sugar. You can do it with pepper or vanilla. It all depends on your imagination and taste.