- Preheat oven to 210 degrees Celsius and lightly oil a rimmed baking sheet.
- Combine oil, maple syrup, and thyme in a bowl. Cut slits down each side of the sweet potatoes, but avoid slicing all the way through.
- Transfer to a prepared baking sheet.
- Brush potatoes with maple mixture and season with salt and pepper.
- Roast until golden brown and tender, 25-30 minutes.