Preheat oven to 450 F. Spray a cookie sheet or pizza pan with non-stick spray.
In a medium bowl, combine cauliflower, egg and mozzarella. Press evenly on the pan. Sprinkle spices such as fennel, oregano, parsley, and/or garlic powder on top.
Bake at 450 degrees for 12-15 minutes (15-20 minutes if you double the recipe). Remove the pan from the oven.
To the crust, add sauce, then toppings and cheese. Place under a broiler at high heat just until cheese is melted.
Pizza crusts can be frozen after the initial baking and used later. Can be doubled for a larger pizza.