Preheat oven to 425 degrees Fahrenheit. Spray cooking spray on a large baking sheet or pizza pan and set aside.
Remove stems and leaves from cauliflower and coarsely grate cauliflower florets to resemble rice to make 2 1/2 cups.
Place grated cauliflower, garlic and a pinch of salt and pepper in a large non-stick skillet over medium heat and cook, stirring occasionally until heated through and just tender, about 7-8 minutes.
Place cauliflower in a medium bowl and cool slightly. Add in mozzarella, egg, basil and oregano and stir until combined.
Spread on baking sheet and press down forming crust about 8-9 inches.
Bake in preheated oven for 12-14 minutes until brown.
Caprese Topping
Spread pesto on top of cooked crust. Top with mozzarella, tomatoes and basil. Bake for an additional 5-7 minutes until cheese is melted.