Preheat the oven to 450 degrees F (230 degrees C).
Place butternut squash, carrots, sweet potato, rutabaga, parsnips, and turnips into a large mixing bowl. Drizzle with olive oil, and toss to coat. Season to taste with kosher salt and pepper: place vegetables into a deep roasting pan.
Garlic, onion, and balsamic vinegar/wine are also possibilities.
Roast in the preheated oven until vegetables are tender and golden brown around the edges, about 45 minutes, stirring once during roasting to ensure even cooking.
