Place the cauliflower in a food processor and pulse until finely chopped.
1 head cauliflower
Scrape the cauliflower into a microwave-safe bowl, cover, and microwave at 100% for 5 minutes.
Transfer the cauliflower onto a clean dish towel and spread it out. Let it sit until cool enough to handle, about 10 minutes.
Preheat the oven to 400°F and line a rimless baking sheet with parchment paper.
Take the dish towel with the cauliflower and bring the edges together to form a pouch. Over a bowl or the sink, twist and squeeze to remove as much liquid as possible.
In a large bowl, combine the cauliflower, mozzarella, Parmesan, oregano, salt, garlic pepper, and egg.
½ cup shredded mozzarella, ¼ cup grated Parmesan, ½ teaspoon dried oregano, ½ teaspoon kosher salt, ¼ teaspoon garlic pepper, 1 large egg
Transfer to the lined baking sheet and form the dough into a circle.
Place in the oven and bake for 20 minutes.