Heat your 5-quart air fryer to 380°F and let it warm up for about 5 minutes.
Cut the chicken breasts into one-inch pieces and toss them in a bowl with olive oil until every piece is lightly coated.
Add cajun seasoning, granulated sugar, kosher salt, smoked paprika, red pepper flakes, poultry seasoning, dried thyme, and dried parsley; mix thoroughly so the chicken is evenly spiced.
Lightly spray your air fryer basket with olive oil spray to prevent sticking, then arrange the chicken pieces in a single layer inside, cooking in batches if needed.
Cook for 7 to 11 minutes, shaking or turning the pieces every few minutes to ensure they cook evenly and reach an internal temperature of 165°F; serve right away.