Remove the leaves and stem from the cauliflower and grate the head with a cheese grater. Place the grated cauliflower into a microwave safe bowl and microwave for 8 minutes.
Preheat oven to 450℉. Grease a cookie sheet with butter or cooking spray.
Mix together the grated cauliflower, egg and cheese. Add Italian Seasoning, garlic and garlic salt and stir. Transfer to the cookie sheet, and using your hands, pat out into a 9″ round. Brush olive oil over top of crust.
Bake for 15 minutes.
Remove from oven. Add your pizza sauce, toppings and cheese. Place under a broiler at high heat just until cheese is melted (approximately 3-4 minutes). Make sure all the toppings are pre-cooked though.