In south India, if you visit any bakery shop, you can find banana chips known as yellow chips also because of its colour. I always call it as yellow chips instead of banana chips. In Tamil nadu, Karnataka and Kerala every where we get it and other places also. Whenever my father visits to kerela , the banana chips will be in demand though I get it in Chennai, just for a change to taste the banana chips of kerela.
My mother also prepares banana chips but it won t be like the shops one, but I like it very much. It is easy to prepare. We have it with plain rice and any dal and any veg dish. It is served as a additional side dish like poppa dam (crispy rice and urad dal crackers). In this the raw banana is used small and thick in size, it will not be the long ones. In Chennai, near marina beach, you can see that few dwellers sell bajjis ( fritters fried with besan batter), they use that small raw bananas, which iam using it . You can use any raw banana which is available to you.