Preheat the air fryer: Set your air fryer to 400°F (200°C) for 3–4 minutes while you prep the chicken.
Cut the chicken: Slice the chicken into bite-size pieces, about 1-inch cubes, for even cooking.
Season: In a bowl, toss the chicken with olive oil, salt, pepper, garlic powder, onion powder, smoked paprika, and chili powder or cayenne if using. If you want a touch more crispness, sprinkle in the cornstarch and toss again.
Arrange in the basket: Place the chicken in a single layer in the air fryer basket.
A little space between pieces helps them brown. Work in batches if needed.
Cook: Air fry for 8–10 minutes, shaking the basket halfway through. Start checking for doneness at 8 minutes.
The edges should be lightly browned, and the center should be cooked through.
Check temperature: For best results, use a meat thermometer. The internal temperature should reach 165°F (74°C).
Rest and serve: Let the bites rest for 2 minutes. Squeeze fresh lemon over the top and sprinkle with herbs if you’d like.