Preheat the air fryer to 350°F (180°C) and lightly grease the basket with cooking spray.
Pat the 3-pound trussed chicken dry with paper towels and rub the olive oil all over the skin.
In a small bowl, combine the salt, black pepper, smoked paprika, Italian seasoning, rosemary, and mustard powder.
Rub the spice mixture evenly over the entire chicken, coating the outside thoroughly.
Place the chicken breast-side down in the air fryer basket and cook at 350°F for 25 minutes.
Carefully flip the chicken so it is breast-side up and continue to cook for another 25 minutes.
Check the internal temperature with a meat thermometer; cook until it reaches 165°F (74°C) in the thickest part of the thigh.
Remove the chicken from the air fryer and let it rest for 5 minutes before carving.