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Preheat the oven to 425°F (220°C).
Lightly grease a large rimmed baking sheet. Combine cauliflower, onion and garlic on the baking sheet. Toss with olive oil, salt and pepper(s) to evenly coat.
Arrange in a single layer and bake for 15 minutes.
Sprinkle with the parmesan cheese and toss through cauliflower. Return to the oven to bake for a further 10-15 minutes until the cauliflower is caramelized on the edges and fork-tender.