Green/Raw banana chips (upperi) is a must for Onam . Banana chips is also known as Kerala Chips or Upperi Or Ethakka Chips. Calicut is famous for banana chips, everywhere you can see Chips Center and as onam holidays started I made some for my kids. I wish you all a Happy Onam. Banana chips is the most common snack you will find in Kerala....and finds its place in all the important occasions...it is easy to make and more healthy than potato chips.....just slit the green skin lengthwise and remove the raw banana from the skin preferably with your hand. Use a slicer to slice the banana. Check out, Updated post and picture. Have you tried making Jackfruit Chips/Chakkavaruthathu ?? Ingredients: Raw banana: 2 kg. Coconut oil: ½ litre. Salt: 2 tsp. Water: little. Turmeric: ½ tsp. Chips cutter or slicer. Method: Wash the bananas and leave it to dry. Cut a slit lengthwise into the banana and remove the skin with your hands and keep it aside. .