Start by trimming the cauliflower head into bite-sized florets and rinse well. Pat them dry so excess moisture doesn’t interfere with crisping later.
In your mixing bowl whisk together the flour, cornstarch, garlic powder, onion powder, paprika and salt. Add the water and stir until you get a smooth batter. Toss the cauliflower florets into the batter so they’re all evenly coated.
Preheat the air fryer to about 400 °F (204 °C). Arrange the battered florets in a single layer in the basket (do not overcrowd). Cook for roughly 5–6 minutes; then flip the florets and brush them with half the buffalo sauce. Continue cooking for another 5–6 minutes or until the edges are golden and crisp.
Once they’re done, remove from the air fryer and immediately toss the florets in the remaining buffalo sauce so every piece is well coated. Serve hot for the best crisp and flavor.