Preheat oven to 450 F. Line a baking sheet with a silpat or nonstick mat.
Put your cauliflower into a food processor and pulse until it breaks up into small pieces that resemble rice.
Measure out 3 cups and transfer to a microwave safe bowl. Microwave for 2 minutes on high. Allow to cool, then squeeze the moisture out of the cauliflower rice.
To the cauliflower, mix in the almond flour, cocoa powder, egg, honey, salt, cinnamon and nutmeg.
Roll into a ball, then press into a round pizza crust, about 1/4 inch thick. Bake for 18-20 minutes, or until the centre is dry and the edges begin to brown.