Roast the Garlic: Preheat your oven to 400°F (200°C). Wrap the whole head of garlic in aluminum foil, drizzle with a tablespoon of olive oil, and roast for 30-35 minutes, until soft and caramelized. Allow it to cool before handling.
Prepare the Tomato Mixture: In a mixing bowl, combine the diced tomatoes, chopped basil, balsamic vinegar, and 2 tablespoons of olive oil. Squeeze the roasted garlic cloves out of their skins and mash them into the tomato mixture. Stir until everything is well combined. Season with salt and pepper to taste.
Toast the Baguette: While the tomato mixture is marinating, place the baguette slices on a baking sheet. Drizzle with olive oil and toast in the oven for about 5-7 minutes until lightly golden and crisp.
Assemble the Bruschetta: Once the baguette slices are toasted, remove them from the oven. Spoon a generous amount of the tomato-roasted garlic mixture onto each slice. If desired, sprinkle grated Parmesan cheese on top.
Serve: Arrange the topped bruschetta on a serving platter and drizzle with any remaining olive oil for added flavor.
Notes
For extra flavor, drizzle with additional olive oil before serving.