Veggie Pizza with Cauliflower Crust

For a flavorful vegetarian pizza, use a homemade cauliflower crust, and top with the mushroom mixture, tomatoes, spinach, basil, and mozzarella.
Preheat the oven to 375 degrees.Put half of the cauliflower in a food processor; chop 10-15 times or until it is finely chopped (like rice). Transfer the cauliflower to a baking sheet lined with parchment paper. Repeat the procedure with the remaining cauliflower. Brush the cauliflower with cooking spray. Bake at 375 ° C for 25 minutes, stirring once. Cool.Increase the oven temperature to 450 degrees.Preheat a large skillet over medium-high heat. Add 1 teaspoon of oil to the skillet; stir to coat. Add the mushrooms and bell pepper; simmer for 5 minutes or until tender. Set aside.Wrap the cauliflower in a clean kitchen towel. Squeeze until smooth. Combine the cauliflower, remaining 1 teaspoon oil, 1/4 cup basil, 1/8 teaspoon black pepper, salt, garlic, 2 ounces mozzarella cheese, egg whites, and parmesan cheese in a bowl. Arrange the cauliflower mixture in 2 (8-inch) circles on a baking sheet lined with parchment paper. Brush the cakes with cooking spray.Bake the cakes at 450 ° C for 22 minutes or until they are lightly browned. Remove the baking sheet from the oven; evenly sprinkle the cakes with the mushroom mixture, tomatoes, spinach, remaining 1/4 cup basil, remaining 1/8 teaspoon black pepper, and remaining mozzarella cheese. Bake for another 7 minutes or until the cheese is melted.