Preheat oven to 400 degrees F. Line a baking sheet with parchment papert; set aside.
To make the cauliflower crust, cut the cauliflower into florets, then add them to a food processor and pulse until finely ground like rice; makes about 2-3 cups.
Transfer to a microwave-safe bowl. and cook for about 5 minutes, or until softened; let cool.
Place cauliflower in a cheese cloth or dish towel, and squeeze out all the excess water so it is as dry as possible.
Transfer to a bowl and mix in the eggs, grated parmesan, onion powder and paprika.
Spread into desired shape on parchment-lined baking sheet and bake in preheated oven at 400F for 40 minutes.
Add the sauce and toppings and bake at 450F for about 5 minutes until cheese has melted and toppings look cooked
Serve immediately while warm.