How to Make It
Heat the oven to 400°F. Process the cauliflower in a processor, and transfer to a microwave-safe bowl. Cook on High for 5-6 mins, until softened. Squeeze out excess water in a clean towel, and then mix with the egg, oregano, and Parmesan, and season.
Spread the cauliflower mix on a baking sheet lined with parchment paper, to a circle that is roughly 9-inches wide. Spray with the nonstick cooking spray, and cook for 10 mins.
Mix the tomato paste with a little hot water, and spread on the cauliflower base. Top with the mozzarella, corn, and red pepper, and cook for another 10 mins. Top with the arugula and serve.