Preheat the oven to 180°C. Spray one flat baking tray, place the pizza base onto it.
Using a spoon spread the olive oil and tomato paste over the base.
Evenly spread the tomatoes, mushrooms, bacon, olives and mozzarella over the pizza.
Lastly, spoon on the caramelised onion relish, basil and season with salt and pepper.
Cook for 15 – 20 minutes until the cheese is melted and starting to brown around the edges.
Garnish with fresh basil to serve.