Fry on medium heat. don't overcrowd.
Stir with a slotted spoon so that the slices don't stick to each other.
Fry till you see the sizzling & bubbles in the oil becoming less and less and almost disappear.
The slices would have changed color and become crisp also.
Remove the fried banana chips with slotted spoon and then drain on paper towels.
When they are cooled, immediately place them in an airtight jar or a container and cover the lid tightly.

Fry the remaining raw slices in batches in similar manner.
When all the banana chips are done and inside the jar, then sprinkle salt and red chilli powder in the jar. Shake the jar.