Place frozen cauliflower in a bowl with 2 tablespoons water, cover and microwave for 3 minutes (it will not be fully cooked, just thawed at this point). Remove from microwave, drain water and transfer to a food processor.
Add the garlic cloves to the food processor as well.
Process the cauliflower & garlic for about 15-30 seconds until it's finely chopped.
Transfer cauliflower to a large bowl and add remaining ingredients. Mix well until thoroughly incorporated.
Preheat oven to 400 degrees and line a baking sheet with parchment paper or a silpat.
Turn out the cauliflower dough onto the baking sheet and form a ball.
Gently press the ball of dough into a round shape until it's just less than 1/4" thick.
Bake for about 30 minutes then broil for another 3-5 minutes. Edges should be brown and crispy at this point.
Remove from oven, top with whatever toppings you choose and return to oven to bake at 400 degrees for another 5-7 minutes.
Notes
If using a fresh head of cauliflower, skip the microwave step and just chop into florets and place in food processor. Process until finely chopped and then saute with olive oil like the directions say.