Trim and quarter the Brussels sprouts and toss in a large bowl with the olive oil and 2 teaspoons salt. Set a 3.5-quart air fryer to 390 degrees F and preheat for 5 minutes. Transfer the sprouts to the air fryer and cook, tossing halfway through, until well-browned and crispy, about 18 minutes.
Transfer to a serving bowl and toss with the Parmesan and lemon zest.
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