Creating BBQ Chicken Quesadilla is straightforward if you follow these simple steps:

1. Prepare the Chicken: In a medium bowl, mix the shredded chicken with barbecue sauce until evenly coated.
2. Heat the Skillet: Place a large skillet over medium heat and add olive oil.
3. Add Vegetables: If using, add sliced red onions and bell peppers to the skillet. Sauté for about 3-4 minutes until they are tender.
4. Assemble Quesadilla: On one half of each tortilla, layer the barbecue chicken mixture, followed by shredded cheese. Optionally, add sautéed vegetables.
5. Fold the Tortilla: Fold the tortilla over to create a half-moon shape, pressing down gently.
6. Cook Quesadilla: Place the quesadilla in the skillet. Cook for about 3-4 minutes on each side or until golden brown and the cheese has melted.
7. Remove and Slice: Once cooked, remove the quesadilla from the skillet and let it cool for a minute. Then, cut it into wedges.
8. Repeat: Repeat the process with the remaining tortillas and filling.
9. Garnish: Optionally, sprinkle chopped cilantro on top before serving.
10. Serve: Serve warm with sour cream and salsa on the side.

These steps will help you create BBQ Chicken Quesadilla effortlessly, ensuring you have a delicious meal ready in no time.