Preheat the oven to 400°F.

Line a large baking sheet with parchment paper.

Make sure the cauliflower florets are roughly 1 inch wide, and arrange them on the baking sheet.

Drizzle the cauliflower with olive oil. Sprinkle with salt and black pepper.

Use a rubber spatula to toss the cauliflower until it is evenly coated in the oil.

Roast on middle rack of oven for 12 minutes.

Open the oven and sprinkle the Parmesan cheese evenly over the cauliflower florets and toss gently with a rubber spatula. Continue roasting until the cauliflower is crisp-tender and the cheese is slightly browned, 10-12 minutes.

Check to see that cauliflower is done. Remove from oven or add time as needed.

Serve immediately.