banana chips.

Cut the Bananas and let them sit out for a little bit to air dry. Spray them lightly with a little bit of oil and then bake them. They may need flipping in the oven after they crisp up on one side.

Alternatively if you're frying them, same thing, just fry one side and flip them and fry again.

Softness is tied to water, oil draws out water and if you can dry them a little beforehand it'll help greatly

Are you using a dehydrator? All the ones I've ever bought came in a sealed bag with a silica gel pack inside.

SLICE BANANA
DEEP FRY
REMOVE FROM OIL AND COOL
SQUASH THEM WITH SOMETHING FLAT AND HEAVY
DEEP FRY AGAIN
WA LA

Works better with plantains. Let them get semi-ripe, the sugars are what caramelize and fry when you put them in the oil. For tostones, simply slice really thin slices and deep fry them, they'll be crunchy. For patacones, smoosh down pieces but leave them a little thick and deep fry them, they'll be crispy on the outside and soft on the inside, like a hashbrown

1 slice thinner
2 get a dehydrator
3 dehydrate at least 24 hours