Prep the chicken. Pat the chicken dry with paper towels. Cut into 1 to 1.5-inch nugget-sized pieces.
Season lightly with salt and pepper if using.
Set up your coating station. Beat the egg in a shallow bowl. Place your chosen crunchy coating in a separate shallow bowl. If using panko or cornflakes, crush slightly for a more even crust.
Preheat the air fryer. Set it to 390°F (200°C) for 3 to 5 minutes.
A hot basket helps the nuggets crisp up quickly.
Coat the chicken. Dip each piece in the egg, letting the excess drip off. Press into the crunchy coating until fully covered. For extra crunch, gently press the coating so it adheres well.
Arrange in the basket. Lightly spray the air fryer basket with cooking spray.
Place nuggets in a single layer with space between them. Don’t overcrowd; work in batches if needed.
Air fry. Cook at 390°F (200°C) for 8 to 10 minutes, flipping halfway through. Spray the tops lightly after flipping for a deeper golden finish.
Check for doneness. The internal temperature should reach 165°F (74°C).
The coating should be crisp and the chicken opaque and juicy.
Serve hot. Let them rest for 2 minutes to set the crust, then serve with ketchup, honey mustard, ranch, or barbecue sauce.