- Preheat your oven to 425°F (220°C) and line a baking sheet with parchment paper or foil. 
- In a large mixing bowl, toss the cauliflower florets with olive oil until well coated. 
- Add garlic powder, smoked paprika, salt, and pepper, tossing to evenly distribute the seasonings. 
- Sprinkle the Parmesan cheese and breadcrumbs (if using) over the cauliflower and toss again to coat. 
- Spread the cauliflower in a single layer on the prepared baking sheet. 
- Roast in the preheated oven for 25-30 minutes, flipping halfway through, until the cauliflower is golden brown and crispy on the edges. 
- Remove from the oven and sprinkle with chopped parsley if desired.