Preheat the air fryer to 400°F (200°C) for about 5 minutes.
In a bowl, whisk together the flour, water, garlic powder, onion powder, smoked paprika, salt, and black pepper to create a batter.
Dip each cauliflower floret into the batter, ensuring it is evenly coated.
Shake off any excess batter and place the coated cauliflower florets in the air fryer basket in a single layer, ensuring they are not touching.
Lightly spray the cauliflower with cooking spray.
Air fry the cauliflower for 12-15 minutes, shaking the basket or flipping the florets halfway through the cooking time for even crispiness.
While the cauliflower is air frying, mix together buffalo sauce and melted butter in a bowl.
Once the cauliflower is golden and crispy, transfer it to a large bowl.
Pour the buffalo sauce mixture over the cauliflower and toss until the florets are evenly coated.
Return the coated cauliflower to the air fryer for an additional 3-5 minutes to allow the sauce to set.
Check the cauliflower for crispiness and adjust the cooking time if needed.
Remove the Vegetarian Buffalo Cauliflower Bites from the air fryer and let them cool for a few minutes.
Serve the Fiery Crunch Bites hot, optionally with celery sticks and ranch dressing on the side.