Preheat oven to 450ºF and line a large baking tray with parchment paper.
Cut cauliflower into bite-sized florets.
Stir together flours, baking powder, and salt. Mix in cold water to form a batter.
Work each floret through batter, allowing excess to drip off before placing on the lined baking sheet. Try not to crowd.
Bake cauliflower for 30 minutes, flipping halfway through.
While cauliflower is baking, whisk together buffalo sauce over low heat. I like to do this in a large saucepan for easy tossing once the bites are done.
When the cauliflower is done, gently swirl and toss in buffalo sauce. Serve immediately with celery sticks, vegan bleu cheese or ranch.