Preheat oven to 500 degrees. Line a pizza pan or sheet pan with parchment paper and grease the parchment. Trim paper to fit the pan or it will scorch.
Remove the stems from the cauliflower and cut into chunks, Place cauliflower in a food processor and pulse until it is the texture of rice. A cheese grater can also be used.
Microwave, uncovered, in a microwave-safe bowl for approximately 4-5 minutes on high. Remove and allow to cool for at least 4-5 minutes. Place paper towels on top of cooked cauliflower and press down firmly to squeeze out as much liquid as possible. Use additional paper towels as needed.
Combine cauliflower, egg, garlic, cheese and seasonings until mixture is doughy. Spread onto the pan and shape into a pizza crust about 12 by 12 inches.
Bake crust for 10 minutes, rotate pan, and cook for another 8-10 minutes, or until the crust is a golden color. Crust will be firm, but not crispy.
Remove from oven and add desired sauce, toppings and cheese.
Return pizza to oven and bake until toppings are lightly browned, about 8-10 minutes.