Toss vegetables in olive oil, salt & pepper and spread out on a rimmed baking sheet.
Roast in a 400 degree oven for 15 minutes or until vegetables are tender-crisp.
Drizzle with 2 Tbsp. balsamic vinegar.
In a large skillet, melt 1 Tbsp. butter over medium heat.
Place bread in skillet; top with mozzarella cheese, roasted vegetables, and fresh shaved Parmesan.
Cook over medium heat until mozzarella is melted and bread is golden brown.
Drizzle with additional balsamic vinegar as desired.