Line baking sheet with parchment or foil. Preheat oven to 400.
Cut cauliflower into florets and add to a large mixing bowl. Add oil, salt, pepper, garlic, and paprika. Toss well to coat. Arrange florets in a single layer on prepared baking sheet. Bake at 400 25 minutes. Sprinkle with cheese. Bake an additional 5 minutes. Sprinkle with parsley, if desired.