Peel the sweet potatoes and chop into 2.5cm rounds. If they are very large sweet potatoes, you can halve the rounds.
Cook the sweet potatoes (using your chosen method: steam, boil, microwave) until just soft with the cinnamon stick. You don't want to over cook them, as you don't want them to fall apart.
Drain the potatoes.
Whilst still hot add the coconut oil to the sweet potatoes and stir through.
Pour the sweet potatoes and coconut oil onto a baking tray ad sprinkle with ½ teaspoon of cinnamon.
Bake for 20 minutes. Remove from the oven, turn them over and add the other ½ teaspoon of cinnamon.