Preheat your oven to medium broil and position the oven rack near the top.
Arrange the baguette slices on a large baking sheet.
Brush each slice lightly with olive oil.
Broil for 2–3 minutes until lightly golden.
Remove from the oven and reduce the oven temperature to 400°F (200°C).
Top each toasted baguette slice with one mozzarella disc.
Add a basil leaf or a small amount of chopped basil.
Place two tomato pieces on top of each slice.
Season lightly with salt and black pepper.
Transfer the baking sheet back to the oven.
Bake for 8–10 minutes until the mozzarella is soft and slightly melted.
Remove from the oven and allow the Caprese Bites to cool for 5 minutes.
Drizzle with balsamic glaze before serving.
Serve warm and enjoy.