Preheat the oven to 400 F. Line a roasting tray with parchment paper. Arrange all of the vegetables (except the mushrooms) on the tray. Drizzle with the olive oil and season with the rosemary, Herbes de Provence, salt, and pepper. Roast for 30 minutes, turning the vegetables occasionally, then add the mushrooms and cook for another 10 minutes or so (test a potato with a fork).

Use a knife to carve some scratches on top of the Brie, then place it in the center of the tray so it opens up as it cooks. Cook for another 5 to 10 minutes.

You now have impromptu fondue! Serve with skewers for dipping the veggies.