Tear or chop the ciabatta into 1 inch bite sized cubes. Spread on a rimmed baking sheet and toss with 2 tablespoons of olive oil, 1 tablespoon of balsamic vinegar and 1 teaspoon of salt. Bake for ~10 minutes until the bread is golden brown. Set aside and let cool.
Place tomatoes in a large bowl. Toss with 1 tablespoon of balsamic vinegar, 2 tablespoons of olive oil, and salt. Add the mozzarella and bread cubes and gently toss. Let sit in the refrigerator for at least ½ hour (and up to four hours).
When ready to serve, toss with fresh basil. I also like to serve over a bed of mixed greens, and top with a little balsamic glaze plus freshly ground pepper.
Recipe by Six Snippets at https://www.sixsnippets.com/panzanella-caprese/