Preheat the Oven: Preheat oven to 425°F and line a baking sheet with parchment paper.
Make the Batter: In a large bowl, whisk together flour, milk, garlic powder, paprika, salt, and black pepper until smooth.
Coat the Cauliflower: Add cauliflower florets to the batter and toss until evenly coated. Shake off excess batter and place in a single layer on the baking sheet.
First Bake: Bake for 20 minutes, flipping halfway through, until lightly golden and set.
Make the Sauce: In a small bowl, mix buffalo sauce with melted butter.
Sauce the Cauliflower: Remove cauliflower from the oven and toss with the buffalo sauce until evenly coated.
Final Bake: Return to the oven and bake for another 10 minutes, or broil for 2–3 minutes for extra crispiness.
Serve: Garnish with fresh parsley if desired and serve warm with ranch or blue cheese dressing.