Preheat oven to 400°F/205°C.
In a roasting pan or large baking pan, toss together all vegetables and herbs with olive oil, butter and salt and pepper to taste. Arrange vegetables in a single layer and place the roasting pan in oven.
Check after 30 minutes and stir with a wooden spoon. Continue roasting vegetables until potatoes are golden and tender, approximately 1 hour total.
Remove from oven and adjust seasoning to taste. Serve immediately.