In a mixing bowl, combine diced tomatoes, chopped basil, minced garlic, olive oil, balsamic vinegar, salt, and black pepper. Mix well and set aside to allow flavors to meld.

Preheat the oven to 400°F (200°C). Arrange the sliced French bread on a baking sheet and drizzle with olive oil. Toast in the oven for about 5 minutes or until golden brown.

Remove the toasted bread from the oven and top each slice with the prepared tomato mixture. Serve immediately.