Preheat Oven: Preheat your oven to 425°F (220°C).
Prepare Cauliflower: Toss cauliflower florets in a large bowl with melted butter until evenly coated.
Season: Mix Parmesan cheese, paprika, and black pepper in a bowl. Sprinkle this mixture over the butter-coated cauliflower, tossing to ensure even coverage.
Arrange on a Baking Sheet: Lightly spray a baking sheet with non-stick cooking spray and spread the seasoned cauliflower in a single layer.
Roast: Bake for 20 minutes, or until the edges are golden brown and crisp.
Serve: Serve hot, pairing with your favorite dip or as a side to your main dish.