olive oil • red onions, chopped • Yukon Gold potatoes, chopped • garlic cloves, peeled and smashed • eggplant, ends trimmed, cut into large chunks • zucchini, ends trimmed, cut into large chunks • bell peppers (assorted colors), seeded, cut into large chunks • tomatoes, seeded, cut into medium chunks • white wine • fresh thyme leaves (or 1 Tbsp fresh oregano leaves) • balsamic vinegar, or more to taste • Kosher salt and fresh black pepper, to taste •