Combine bread, parmesan, basil, salt and pepper in a food processor. Process into a crumb mixture. Add olive oil and pulse a couple of times to combine. Set aside.
Assemble gratin by alternating tomato and mozzarella in layers in individual gratin dishes.
Drizzle each dish with ½ tablespoon of olive oil. Top with crumb mixture.
Bake at 400 degrees for 10-15 minutes, or until topping is lightly golden. You want cheese to be soft, but not melted.
Garnish each with 1 thinly sliced basil leaf.
Recipe by Pick Fresh Foods at https://pickfreshfoods.com/fresh-caprese-gratin/