Pre-heat the oven to 180C (360F) fan-forced and line a baking tray with baking paper.
Lay out the vol au vent cases on the tray (as many as you need). Line each one with a basil leaf so that it sticks out the top. Place a piece of mozzarella then a quarter of a cherry tomato inside each one and spray with oil.
Bake until the cheese is melted (about 10 minutes).
Notes
Nutritional values are for filling only not for the vol-au-vent cases.