Preheat the oven to 400 degrees F (200 C). Line a baking tray with parchment paper, and cut the cauliflower into florets.
Into a large mixing bowl, add the flour, garlic powder, salt, and mix everything.
Add the milk and stir until combined. The mixture should be thick. Add the cauliflower florets and coat them evenly.
Into a separate bowl, add the panko bread crumbs. Transfer the cauliflower florets to that bowl and coat them with the bread crumbs.
Place the coated florets into the baking tray without touching each other and bake for about 20 minutes, flipping over halfway through.
While the florets are baking, mix the buffalo sauce with melted butter and set it aside.
Remove the florets from the oven, brush each one with the buffalo sauce mixture and return to the oven to cook for additional 20 minutes. Serve them with garlic dip!