We found this place called Taro Ko Farms in Hanapepe!
This is one of our favorite stops in Kauai! This is a little run down plantation house that produces the best sweet potato and taro chips in the world. They are right out of the fryer and into the bag. They are so popular that there have been days he is sold out within 1 hour of making them. I buy at least 4 or 5 bags (they are small) each visit. The cost is $4 each if I remember correctly.
You have to get there after noon or 1pm or they are not ready. I suggest calling first if possible to see if he even has them because in some cases this place is out of the way. But worth the trip.
The building is close to the art galleries and stores, located at the beginning of the main street.
You won't regret the trip I promise. ( Try both. The sweet potato is my favorite)