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In a shallow dish, whisk together the egg whites and water until slightly foamy. In a separate shallow dish, thoroughly combine ¼ cup of Parmesan cheese, bread crumbs, and salt.
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Dip the asparagus in the egg white, then roll in the cheese mixture to coat well.
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Place the asparagus in the air fryer basket in a single layer, leaving space between each spear. Spritz the asparagus with cooking spray.
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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 6 minutes.
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When cooking is complete, the asparagus should be golden brown and crisp. Remove from the oven. Sprinkle with the remaining 2 tablespoons of cheese and serve hot.