<p>Preheat oven to 400ºF. Spread cornbread in a single layer on a rimmed baking sheet. Toast in the oven for about eight minutes or until dry and lightly golden, tossing once halfway through. Set aside to cool.</p>
<p>Meanwhile, whisk the vinegars, garlic, and olive oil together in a small bowl, seasoning to taste with salt and pepper.</p>
<p>Combine the tomatoes, vegetables, and mozzarella in a large serving bowl.