1. Preheat oven to 420F (210C).
2. Place zucchini, squash, broccoli florets, onion, pepper and mushrooms in a medium baking dish.
3. Season with salt and pepper. Add olive oil, balsamic vinegar and thyme. Toss to combine.
4. Bake in the preheated oven for about 13 minutes, until tender but slightly crisp. Enjoy!