01 - Preheat the oven to 425°F and line a large baking sheet with parchment paper.
02 - Combine the carrots, parsnips, sweet potato, rutabaga, and red onion in a large mixing bowl.
03 - Whisk together maple syrup, olive oil, thyme, salt, and black pepper in a small bowl.
04 - Pour the glaze over the vegetables and toss thoroughly to ensure even coating.
05 - Spread the glazed vegetables in a single layer on the prepared baking sheet.
06 - Roast for 35 to 40 minutes, stirring once halfway through, until vegetables are tender and caramelized at the edges.
07 - Serve hot, optionally garnished with extra fresh thyme leaves.