Place the cauliflower florets in a blender, and give it a quick whizz to make the riced cauliflower. Do this in batches, if needed.
Place the riced cauliflower in a microwave safe bowl and cover with a lid. Microwave on high for 10 minutes.
Place riced cauliflower in a large bowl. When cooled, squeeze out as much water as possible.
Combine riced cauliflower, garlic, egg, Italian seasoning and cheese in a large bowl. Season with salt and pepper.
Line a large baking tray with baking paper. Press the cauliflower mixture firmly onto the tray as thin as possible. Bake for 20 minutes or until golden.
Add the Topping:
When the crust is done, spread the tomato paste on it. Sprinkle with Italian seasoning. Add the cheese. Then add all the veggies. Place it back in the oven, and bake for another 10 minutes.