Start by removing the leaves and core from your cauliflower head. Chop it into chunks and pulse in a food processor until it resembles fine rice grains. Avoid over-processing into mush. Transfer the cauliflower rice into a microwave-safe bowl, add 3 tablespoons of water, cover, and microwave on high for 4-5 minutes until tender but not soggy. Let it cool slightly.
Once cooled, scoop the cauliflower rice into a clean kitchen towel or cheesecloth. Twist and squeeze firmly to remove as much water as possible—this step is crucial to achieving a crisp crust.
In a large bowl, combine the drained cauliflower rice, 2 egg whites, 1 cup of shredded low-fat mozzarella, garlic powder, dried oregano, dried basil, onion powder, and smoked paprika. Mix well until all the ingredients are fully incorporated.
Line your baking sheet with parchment paper. Transfer the cauliflower mixture onto the sheet, shaping it into a circle or rectangle about 1/4-inch thick. Press firmly to compact the mixture, ensuring the crust holds together.
Bake the crust in a preheated oven at 425°F (220°C) for approximately 15-20 minutes. The edges should turn golden brown and the crust should feel firm to the touch.
Remove the crust from the oven. Spread 1/2 cup of no sugar added pizza sauce evenly over the top. Sprinkle the diced green pepper, mushrooms, red onion, and sliced black olives across the pizza. Feel free to add a little extra shredded cheese if desired.
Return the pizza to the oven and bake for another 8-10 minutes, or until the cheese is melted and bubbly, and the vegetables are tender.
Let the pizza cool for a couple of minutes before slicing. This allows the crust to firm up even more. Serve warm and savor every bite of your homemade cauliflower pizza!