Creating Cheesy Chicken Quesadilla is simple if you follow these easy steps:

1. Prepare the Chicken: If not already done, cook and shred the chicken. You can use rotisserie chicken for convenience.
2. Sauté Vegetables: In a skillet, heat the olive oil over medium heat. Add sliced bell peppers and onions, cooking until softened, about 3-4 minutes.
3. Mix Filling: In a bowl, combine shredded chicken, sautéed vegetables, shredded cheese, and taco seasoning if using. Mix until well combined.
4. Heat Tortilla: In the same skillet, place one tortilla and heat for about 1 minute until warm.
5. Add Filling: Spoon a portion of the chicken mixture onto half of the tortilla, spreading it evenly.
6. Fold Tortilla: Carefully fold the tortilla over the filling, pressing down gently.
7. Cook Quesadilla: Cook for 2-3 minutes on each side or until the tortilla is golden brown and the cheese is melted.
8. Remove and Slice: Once cooked, remove the quesadilla from the skillet and let it rest for a minute. Cut into wedges.
9. Repeat: Repeat the process with the remaining tortillas and filling.
10. Serve: Serve warm with sour cream, salsa, and a sprinkle of fresh cilantro if desired.

These steps will guide you in creating the most incredible Cheesy Chicken Quesadilla with ease!