Prep the Cauliflower:** Cut cauliflower into uniform bite-sized florets, removing excess stem. Pat dry with paper towels.
In a large bowl, whisk together flour, cornstarch, baking powder, garlic powder, onion powder, smoked paprika, salt, and pepper. Gradually whisk in plant-based milk until smooth. The batter should coat the back of a spoon.
Place panko breadcrumbs mixed with olive oil in a shallow dish. Preheat air fryer to 375°F (190°C).
Coat the Cauliflower: Dip each cauliflower floret into the batter, allowing excess to drip off, then roll in the seasoned panko mixture, pressing gently to adhere.
First Cook: Place coated florets in air fryer basket in a single layer (work in batches if needed). Cook for 12 minutes, flipping halfway through.
While cauliflower cooks, whisk together hot sauce, melted vegan butter, maple syrup, garlic powder, and apple cider vinegar in a large bowl.
Remove cauliflower from air fryer and immediately toss with buffalo sauce in the bowl. Return to air fryer for 3-5 minutes until sauce is slightly caramelized.
Transfer to serving platter and serve immediately with celery sticks, carrots, and your favorite vegan dipping sauce.