Prep the oven: Preheat to 425°F (220°C). Line a baking sheet with parchment or place a wire rack on top for superior airflow and crispiness.
Make the batter: In a large bowl, whisk flour, cornstarch, garlic powder, onion powder, paprika, salt, and pepper. Pour in the milk and whisk until smooth and slightly thick the batter should coat a spoon without dripping too fast.
Coat the cauliflower: Add the cauliflower florets into the batter. Toss thoroughly to ensure every piece is fully coated. Drizzle olive oil over the top and toss again for even browning.
Bake the cauliflower: Arrange florets on the baking sheet, leaving space between each one. Bake 20–25 minutes, flipping halfway, until golden and crisp on the edges.
Prepare the sauce: In a small saucepan over low heat, combine buffalo sauce, honey, melted butter, olive oil, lemon juice, garlic powder, and chili flakes. Heat just until warm and smooth do not boil.
Coat and caramelize: Transfer the baked cauliflower to a large bowl. Pour the hot honey buffalo sauce over and toss gently with tongs. Return to the baking sheet and bake for an additional 5–7 minutes to caramelize the glaze.
Rest for crispiness: Let the cauliflower sit for 3–5 minutes to allow the sauce to set and slightly thicken.
Serve: Garnish with parsley, green onions, or sesame seeds. Serve immediately with ranch or blue cheese dip.