Preheat the oven to 400°F (200°C). Slice the French bread into ¾-inch thick pieces.

Drizzle olive oil over the bread slices and toast in the oven for 5 to 7 minutes until golden brown.

In a bowl, combine diced tomatoes, minced garlic, grated Parmesan, and basil. Add balsamic vinegar, salt, and pepper.

Let the tomato mixture sit at room temperature for 10 to 15 minutes to meld the flavors.

Top the toasted bread slices with the tomato mixture and drizzle with balsamic if desired.

Serve immediately while the bread is still warm and crispy.