Preheat oven to 400°F. Line a baking sheet with parchment paper.
Steam or microwave cauliflower rice until tender. Let cool, then squeeze out as much water as possible using a clean towel.
In a bowl, mix cauliflower, mozzarella, Parmesan, egg, Italian seasoning, salt, and pepper until combined.
Press mixture onto parchment into a thin round crust.
Bake 15–20 minutes, until golden and firm.
Spread pizza sauce over crust, sprinkle with mozzarella, and add toppings.
Return to oven for 8–10 minutes, until cheese is bubbly.
Garnish with fresh basil, slice, and serve.