Prep the Chicken - Remove giblets and neck from the chicken cavity. Pat the chicken completely dry with paper towels.
Stuff the Cavity - Place the halved lemon and onion inside the cavity of the chicken.
Season the Chicken - Rub olive oil all over the outside of the chicken. In a small bowl, mix paprika, garlic powder, onion powder, dried thyme, salt, and pepper. Rub seasoning evenly over the entire chicken.
Air Fry – First Side - Place the chicken breast-side down in the air fryer basket. Cook at 360°F for 30 minutes.
Flip & Finish Cooking - Carefully flip the chicken breast-side up. Continue cooking at 360°F for another 25–35 minutes, or until the internal temperature reaches 165°F in the thickest part of the breast.
Rest & Carve - Let the chicken rest for 10 minutes before carving. Serve warm.