01 - Preheat the oven to 425 degrees Fahrenheit. Line a large baking sheet with parchment paper to prevent sticking.
02 - In a large mixing bowl, combine the carrots, parsnips, sweet potato, rutabaga (or turnip), and red onion wedges.
03 - Drizzle the olive oil over the vegetable mixture. Add the thyme, minced garlic, sea salt, and black pepper. Toss thoroughly until all vegetables are evenly coated.
04 - Spread the seasoned vegetables in a single layer on the prepared baking sheet. Ensure pieces are not overcrowded to allow for proper caramelization.
05 - Roast in the preheated oven for 35 to 40 minutes. Stir the vegetables once halfway through the cooking time to ensure even browning and tenderness.
06 - Remove from the oven once the vegetables are golden and tender. Serve hot, optionally garnished with additional fresh thyme leaves.