01 - Preheat the oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large bowl, toss the carrots with olive oil, melted butter, maple syrup, salt, pepper, cinnamon if using, and thyme until evenly coated.
03 - Spread the coated carrots in a single layer on the prepared baking sheet.
04 - Roast for 25 to 30 minutes, turning once halfway through, until the carrots are tender and caramelized at the edges.
05 - Transfer carrots to a serving platter, spoon any remaining glaze from the pan over them, and garnish with extra thyme.