Preheat your oven to 400°F (200°C).
Slice the baguette or ciabatta into 1/2 inch thick slices.
Arrange the bread slices on a baking sheet.
Brush each slice lightly with olive oil.
Bake in the oven for about 10 minutes, until golden and crisp.
In a bowl, combine diced tomatoes, minced garlic, chopped basil, olive oil, salt, and pepper.
Mix well to combine all ingredients.
Once the bread is ready, remove it from the oven.
Top each slice with the tomato mixture and drizzle with balsamic vinegar if desired.