Preheat oven to 350 degrees F. Line a baking sheet with parchment paper.
Place baguette slices onto prepared baking sheet. Drizzle with 2 tablespoons olive oil. Place into oven and bake for 8-10 minutes, or until golden brown.
Top each baguette slice with mozzarella cheese. Place into oven and bake for 4-6 minutes, or until cheese has melted.
In a large bowl, combine tomatoes, remaining 1 tablespoon olive oil, balsamic vinegar, garlic, salt and pepper, to taste.
Top each baguette slice with tomato mixture, garnished with basil.