1. Preheat oven to 425°. 2. Cut cauliflower into florets; toss on a large rimmed baking sheet with sliced onion, thyme sprigs, unpeeled garlic cloves, and olive oil; season with kosher salt and freshly ground black pepper. 3. Roast, tossing occasionally, until almost tender, 35-40 minutes. 4. Sprinkle with grated Parmesan, toss to combine, and roast until cauliflower is tender, 10-12 minutes longer. 5. Enjoy! ---------------------------------------------------------------------------
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