In a medium bowl, combine the cooked chicken, shredded cheese, bell peppers, and onion. Give it a gentle toss so everything is evenly mixed. This ensures every bite is loaded with flavor.

Lay one tortilla flat and spread the filling evenly over half of it. Fold the tortilla over to create a half-moon shape. Lightly press down so it holds together.

Preheat your air fryer to 375°F (190°C) for a few minutes. Spray both sides of the quesadilla with a light coat of olive oil spray—this helps it turn golden and crisp.

Place the quesadilla in the air fryer basket. Cook for 5–7 minutes, flipping halfway through, until both sides are golden brown and the cheese is fully melted.

Let the quesadilla rest for 1–2 minutes before slicing into wedges. This helps keep the filling from spilling out. Serve with salsa, guacamole, or sour cream for dipping.