Preheat oven to 200c/390f.
Add the sweet potato to a large oven dish, spray with olive oil, and toss to coat.
Roast for 45–55 minutes, flipping halfway, until golden and tender. Note: you can also cook this in the air fryer and it takes around 20 minutes.
Store in the fridge for up to 3 days, or freeze up to 2 months.