Prepare the chicken: Slice chicken breasts into bite-sized, uniform pieces, approximately 1-inch cubes. Pat them thoroughly dry with paper towels to ensure maximum crispiness.

Create the seasoning blend: In a medium bowl, whisk together olive oil, dried oregano, garlic powder, onion powder, smoked paprika, salt, black pepper, lemon zest, and cornstarch until well combined.

Coat the chicken: Add the dried chicken pieces to the bowl with the seasoning mixture. Toss thoroughly with your hands or tongs until every piece is evenly coated.

Air fry the chicken: Preheat your air fryer to 204 °C (200 °C) for 3-5 minutes. Arrange the seasoned chicken in a single layer in the air fryer basket, ensuring there is space for air circulation. Avoid overcrowding; cook in batches if necessary.

Cook for 8-12 minutes, flipping halfway through, until the chicken is golden brown, crispy, and cooked through with an internal temperature of 74 °C (74 °C). Cooking time may vary slightly based on the size of the pieces and your air fryer model.

Serve immediately. Allow chicken to rest for a minute before serving to retain juiciness.