Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper.
In a large bowl, mix flour, water, garlic powder, smoked paprika, salt, and black pepper. Stir until smooth.
Add cauliflower florets to the batter. Toss until fully coated.
Spread the coated cauliflower on the baking sheet in a single layer. Leave space between pieces.
Bake for 22–25 minutes. Flip halfway through so both sides crisp up.
In a small bowl, mix buffalo sauce with melted butter or olive oil.
Remove cauliflower from the oven. Gently toss with the buffalo sauce.
Return to the oven and bake for another 10–12 minutes until sticky and lightly crispy.
Remove from the oven and let rest for 2 minutes before serving.