How to make it
Heat oven to 350°F.
In a food processor, working in batches, blitz cauliflower and squash until grated.
Transfer to a baking sheet and bake until vegetables reduce, 15 to 20 minutes; cool to room temperature.
Transfer vegetables to the bowl of a stand mixer and add remaining ingredients; mix on medium using a dough hook until fully incorporated, 3 minutes.
Form dough into a ball, return to bowl, cover with plastic wrap, and rest 1 hour.
Cut dough into 6 pieces and roll each into a 12-inch disk.
Working in batches, transfer dough to a baking sheet and par-bake in a 350°F oven until edges turn golden, 3 minutes.
When making pizzas, turn rounds over and top as desired, but don’t overload dough. (Refrigerate unused rounds in ziplock bags.)
Bake until toppings are hot and cheese is melted, 8 to 10 minutes.