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Combine the pineapple juice, cider vinegar, ginger, ketchup, garlic, and sugar in a saucepan. Stir to mix well. Heat over low heat for 5 minutes or until thickened. Fold in the sherry and soy sauce.
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Dunk the chicken cubes in the mixture. Press to submerge. Wrap the bowl in plastic and refrigerate to marinate for at least an hour.
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Spritz the air fryer basket with cooking spray.
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Remove the chicken cubes from the marinade. Shake the excess off and put in the basket. Spritz 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 360ºF (182ºC) and set time to 15 minutes.
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Flip the chicken cubes at least three times during the air frying.
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When cooking is complete, the chicken cubes should be glazed and well browned.
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Serve immediately.