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Preheat the air fryer to 350°F if required by your model.
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Stir together the macaroni, shredded cheese, dry mustard, salt, pepper, and garlic powder.
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Pour the ingredients in the air fryer pan and top with milk and heavy cream. Make sure all the pasta is fully covered by the milk.
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Set the air fryer to cook for 20 minutes. Halfway through the cook time, remove the pan from the air fryer and stir the ingredients.
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When 1 minute is left, remove the pan and top with additional cheese, if desired.
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Cook for additional minute to melt the cheese on top.