Place the dried orange peel in a spice grinder or small food processor and pulse until it becomes a fine powder.

Add the sugar and optional cinnamon.

Pulse just a few times to distribute the orange evenly. Do not process it too long or the sugar may become powdery.

Transfer the mixture to a clean, completely dry jar and close it tightly.

If you purchase dried orange peel, choose a food-grade product without added sugar or preservatives. If you dry your own orange peel, make sure it is crisp and contains no soft or flexible spots before grinding it.