Heat your air fryer at 380°F for about five minutes to get it ready.
Cut the chicken breasts into small, bite-sized pieces about an inch each and place them in a medium bowl.
Drizzle the olive oil over the chicken and toss to ensure every piece is lightly coated.
Add the cajun seasoning, granulated sugar, kosher salt, smoked paprika, red pepper flakes, poultry seasoning, dried thyme, and dried parsley flakes to the bowl and mix everything well so the chicken is evenly spiced.
Lightly spray the air fryer basket with olive oil spray to prevent sticking.
Spread the chicken pieces in a single layer inside the basket; if needed, cook them in batches to avoid overcrowding.
Cook the chicken bites for 7 to 11 minutes, shaking the basket every few minutes or turning the pieces with tongs to ensure even cooking.
Check that the chicken pieces reach an internal temperature of 165°F before serving immediately.