01 - Heat the oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large mixing bowl, combine carrots, olive oil, melted butter, maple syrup, sea salt, black pepper, cinnamon if using, and thyme leaves. Toss until carrots are evenly coated.
03 - Spread the carrots in a single layer on the prepared baking sheet.
04 - Place the baking sheet in the oven and roast carrots for 25 to 30 minutes, turning once halfway through, until tender and edges are caramelized.
05 - Transfer carrots to a serving platter, drizzle with any remaining glaze from the pan, and garnish with additional fresh thyme leaves.