Preheat your oven to 400°F (200°C).
- Peel and cube the sweet potatoes into bite-sized pieces and place them on a baking sheet.
- Drizzle the olive oil or melted butter over the sweet potatoes, and toss them to coat evenly.
- Sprinkle the cinnamon, nutmeg (if using), salt, and pepper over the potatoes, then toss again to evenly distribute the spices.
- Roast the sweet potatoes in the oven for 25–30 minutes, or until they are tender and lightly golden on the edges, tossing halfway through to ensure even cooking.
- Once the sweet potatoes are done, remove them from the oven and drizzle the maple syrup over the top. Toss gently to coat and caramelize the potatoes with the syrup.
- Return the sweet potatoes to the oven for an additional 5 minutes to allow the maple syrup to soak in and caramelize slightly.
- Garnish with fresh herbs if desired and serve warm.