Preheat oven to 375°F (190°C) and line a baking sheet.
Slice baguette in half lengthwise, place cut-side up.
Mix tomatoes, garlic, basil, olive oil, and balsamic.
Brush bread with olive oil, toast 5–7 minutes.
Top with tomato mixture evenly.
Sprinkle Parmesan if using.
Bake 8–10 minutes until tomatoes soften and edges golden.
Cool slightly, slice, and serve warm.
