Preheat your oven to 400F (200C).
Roll out the puff pastry sheet on a lightly floured surface to fit your tart pan or baking sheet. Transfer it to the pan and fold the edges to create a border.
Arrange the sliced tomatoes and mozzarella alternately over the puff pastry. Tuck fresh basil leaves between the slices.
Drizzle olive oil over the tomatoes and mozzarella. Season with salt and pepper to taste.
Bake in the preheated oven for 20-25 minutes or until the puff pastry is golden brown and the tomatoes are slightly roasted.
If desired, drizzle balsamic glaze over the tart for a touch of sweetness and acidity.
Remove from the oven, let it cool slightly, and garnish with additional fresh basil leaves. Slice and serve warm.
