2 C broccoli florets
2 C cremini mushrooms
2 C chopped butternut squash
1 zucchini, sliced and quartered
1 yellow squash, sliced and quartered
1 red bell pepper, chopped
1 red onion, chopped
2 T olive oil
2 T balsamic vinegar, or more, to taste
4 cloves garlic, minced
1 1/2 tsp dried thyme
Kosher salt and freshly ground black pepper, to taste