Colorful roasted root vegetables caramelized to perfection are a healthy, vegetarian, family-style side dish. This fresh, clean eats option supports a calorie deficit and adds vibrant nutrition to any meal.
Preheat the oven to 425°F (220°C) for at least 15 minutes for even roasting.
Peel and cut the carrots, parsnips, and sweet potato into even 1-inch pieces; slice the red onion into large wedges for consistent cooking.
On a large rimmed baking sheet, toss all vegetables with olive oil, salt, black pepper, and fresh thyme, ensuring all pieces are coated thoroughly.
Spread vegetables out in a single layer, spacing them out to avoid overcrowding, which helps caramelization.
Roast for 35–40 minutes, tossing once halfway through, until vegetables are deeply golden on the edges and fork-tender.