01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - Place carrots in a single layer on the prepared baking sheet.
03 - Whisk together maple syrup, olive oil, melted butter (if using), sea salt, black pepper, and cinnamon in a small bowl.
04 - Pour the glaze over the carrots and toss gently to ensure even coating.
05 - Roast in the oven for 25 to 30 minutes, turning once halfway through, until carrots are tender and caramelized.
06 - Transfer carrots to a serving dish and sprinkle with chopped parsley if desired. Serve warm.