Using a food processor, pulse the cauliflower, onion, and garlic.
Cook the cauliflower rice in a pan with olive oil, approximately 8 minutes, stirring often.
Add the basil, Saputo Mozzarellissima shredded cheese, Saputo Very Fine Shredded Romano cheese, salt, pepper, egg, and half the breadcrumbs. Stir and set aside.
Preheat the oven to 180°C (350°F).
Pour the tomato sauce into a greased, oven-safe dish.
Shape the cauliflower mixture into balls the size of small oranges and roll them in remaining breadcrumbs.
Place the arancini over the tomato sauce and bake in the oven for 25 minutes.
