In a large bowl, add the roasted zucchini, toasted bread, tomatoes, green pepper, red onion, and mozzarella. In a small bowl or dressing container, whisk together the dressing ingredients until combined. Drizzle over the salad and toss gently to combine. This Roasted Zucchini Panzanella is best served immediately. (Though, I enjoyed the leftover portion just as much the following day.)