Arrange the florets in the basket in a single layer, without overlapping.
Cook at 180 °C for 15 minutes, shaking the basket halfway through cooking (after 8 minutes).
About 2 minutes before the end of cooking, sprinkle with grated Parmesan and panko breadcrumbs, if using. Increase the temperature to 200 °C and cook for 2 more minutes to crisp.