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In a bowl, combine the cauliflower florets, olive oil, garlic powder, salt, and turmeric and toss to coat. Transfer to the air fryer basket.
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Put the air fryer basket on the baking pan and slide into Rack Position 2, select Air Fry, set temperature to 390ºF (199ºC), and set time to 15 minutes.
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After 5 minutes, remove from the oven and stir the cauliflower florets. Return to the oven and continue cooking.
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After 6 minutes, remove from the oven and stir the cauliflower. Return to the oven and continue cooking for 4 minutes. The cauliflower florets should be crisp-tender.
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When cooking is complete, remove from the oven to a plate. Sprinkle with the shredded Parmesan cheese and toss well. Serve warm.