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