Preheat the oven to 290°F (140°C). Line a baking sheet with parchment paper.
Optional: add the sweet potato slices to a bowl, and toss them with a drizzle of olive oil.
Arrange the slices on the baking sheet on a single layer, each slice touching the next.
Bake in the oven at 290°F (140°C) for 15 to 20 minutes until they look all wrinkled up and are well dehydrated.You can bake two baking sheets simultaneously if you have a fan-assisted oven.
Serve on a platter with a pinch of salt and your favorite dipping sauce.