Place the cauliflower in food processor and mince. Add the mozzarella and egg, then stir it together with a spoon or fork. 2 cups cauliflower, 1 cup mozzarella cheese, 1 eggs
Press onto parchment paper in a circle or square (or any other desired pizza shape) and place on a baking sheet or pizza stone. Cook for 10-15 minutes, or until the bottom has browned a bit.
Using another sheet of parchment, carefully flip the pizza crust onto the new parchment paper. Add your toppings to the bottom of the crust (it gets a little crispier that way), and bake another 7-10 minutes or until browned.
Video
Notes
For an extra-crispy crust, try baking the cauliflower base on a preheated pizza stone or cast iron pan instead of a regular baking sheet.