Preheat the oven to 250 degrees F (120 degrees C). Line a rimmed baking sheet with parchment paper.
Cut sweet potato into ¼-inch slices crosswise and cut larger slices in half. Place slices on the prepared baking sheet.
Bake in the preheated oven for 1 hour. Turn slices over and bake for 1 ½ hours more. Turn oven off and leave chews in the oven until completely cooled.
