Preheat the oven to 200C/400F/Gas 6.
Season the tomatoes with salt and freshly ground black pepper and spread over the pitta breads. Sprinkle over the cheese and sliced sausage.
Drizzle each mini pizza with a little olive oil and place onto a non-stick baking sheet. Transfer to the oven and bake for 6-8 minutes, or until the cheese is melted and golden-brown.
To serve, place the mini pizzas onto plates and sprinkle over the basil.