- Preheat oven to 120°C. Line a baking sheet with baking paper.
- In a large bowl, add sliced sweet potatoes. Drizzle over oil and coat evenly.
- Place on prepared baking sheet in a single layer. Sprinkle over with sea salt.
- Bake for 2-2½ hours, flipping chips over every 30 mins, or until crispy.
- Remove from oven and transfer to a wire rack to cool completely.
- Season with more sea salt and serve.