Cut the tomatoes into small pieces and mix them in a bowl with basil, garlic, Parmesan, and a little salt and pepper. Let it stand and marinate while the bread is prepared.
Brush the bread slices with olive oil and bake them in the oven for 5 minutes at 200 degrees Celsius (392 degrees Fahrenheit).
Take the bread out and distribute the tomato mixture on top. Bake again for 5 minutes at the same temperature.