Preheat oven to 425°F and line baking sheet with parchment paper.
Using a box grater or a food processor, grate the cauliflower until all is evenly grated.
Transfer cauliflower to a large bowl with eggs, garlic, oregano, 1 cup mozzarella, Parmesan, and season with salt and pepper. Stir until completely combined.
Transfer dough to prepared baking sheet and pat into a crust. Bake until golden and dried out, 25 minutes.
Sprinkle with remaining mozzarella, crushed red pepper flakes, and parsley and bake until cheese is melted, 5 to 10 minutes more.
Slice and serve.