Preheat the air fryer to 400°F.

In a large bowl, whisk together the flour, cornstarch, garlic powder, onion powder, paprika, and salt. Add the water and whisk until smooth. Add the cauliflower and stir to coat.

Lift the cauliflower florets out of the batter, allowing any excess batter to drip back into the bowl. Arrange in a single layer in the air fryer basket, leaving a little space around each floret.

Air fry for 9 minutes. Remove from the air fryer and use a spatula to carefully flip the florets. Brush with some of the buffalo sauce. Air fry for another 5 to 10 minutes, or until the cauliflower is dark and crisp around the edges.

Remove from the air fryer and brush with additional buffalo sauce. If desired, serve with vegan ranch for dipping.