Preheat oven to 450°F.
In a small bowl, combine breadcrumbs, garlic powder, salt and pepper.
In a large bowl, coat cauliflower with olive oil.
Pour prepared breadcrumbs over cauliflower and toss to coat.
Spread cauliflower on a parchment-lined baking sheet.
Roast for 10 minutes.
In a large mixing bowl, combine Buffalo sauce and melted butter.
Add roasted cauliflower, toss to coat.
Return to parchment-lined baking sheet; roast for another 5 minutes.
Serve with ranch dressing and celery.