Preheat oven to 450F.Line a large, 15x21-inch baking sheet with parchment paper and set aside. If you are using smaller baking sheets you will need to roast the vegetables in two batches or on two baking sheets.Prepare the dressing by whisking the olive oil, vinegar, Dijon mustard, basil, thyme, garlic, pepper and salt in a small bowl, until well combined.Place the vegetables in a large bowl, big enough to accommodate all the veggies and still having some head space left to allow tossing. Pour the dressing all over the vegetables and toss until the veggies are evenly covered by the dressing.Transfer the vegetables onto the baking dish and spread evenly. Sprinkle additional salt and pepper on top.Bake on top rack for 45 minutes. Serve the roasted vegetables immediately.