These cheesy quesadillas are a great way to use up leftover rotisserie chicken. Simply shred the chicken and mix it with some salsa. Warm up some tortillas, add the chicken mixture, and top with some shredded cheese. Fold the tortillas in half and cook them in a skillet until the cheese is melted and the tortillas are crispy. Serve the quesadillas with some sour cream and guacamole for a delicious meal.