Preheat your oven to 220°C (430°F) and line a baking sheet with parchment paper.
Chop parsnips, carrots, and sweet potatoes into roughly equal-sized pieces, about 1 to 1.5 inches thick, creating a colorful mix of roots.
Place all the chopped vegetables into a large mixing bowl, then drizzle with olive oil, ensuring they are evenly coated with a gentle toss.
Add salt, pepper, chopped herbs, and a splash of balsamic vinegar to the bowl, then toss again until everything is well combined and coated with the seasonings.
Spread the vegetables evenly across the prepared baking sheet, making sure they are in a single layer for optimal roasting.
Roast in the oven for 25-30 minutes, flipping the vegetables halfway through, until they are golden around the edges and tender when pierced with a fork.
Remove from the oven and let the vegetables rest for 5 minutes; this helps them firm up slightly and develop their smoky, caramelized flavor.
Give the vegetables a final gentle toss to recoat them with any juices or balsamic glaze that has accumulated, then serve hot for a rustic, festive presentation.