Preheat your oven to 400°F. Place a baking sheet in the oven to heat. Cut the cauliflower into small florets and place them in a food processor. Pulse until they reach a rice-like consistency.
Transfer the cauliflower rice to a microwave-safe bowl, cover with plastic wrap and microwave for 4–5 minutes until the cauliflower is tender. Let it cool down. Place the cooked cauliflower in a kitchen towel or cheesecloth and squeeze out as much moisture as possible.
Add the drained cauliflower, shredded cheese, beaten egg, dried oregano, salt, and pepper to a bowl. Mix with your hands.
Line another baking sheet with parchment paper. Put the crust mixture onto the paper. Press the dough down into an even circle, resembling a pizza crust.