Preheat your oven to 425 degrees
Combine the diced roma tomatoes, red onion, basil and finely minced garlic in a large bowl
Drizzle 1 tablespoon of olive oil over the mixture and add a pinch of salt and pepper
Toss everything until fully combined and then taste to see if more salt and/or black pepper is necessary
Slice your italian bread into 1/2 inch slices and place them onto parchment lined baking sheets
Lightly brush each slice with olive oil and top with bruschetta
Sprinkle finely shredded parmesan over each piece
Bake in a 425 degree oven until the parmesan melts and the bread is crispy
Drizzle with balsamic vinegar
Serve hot or at room temperature