Quesadillas are a fun and easy way to use up leftover rotisserie chicken. Simply shred the chicken and add it to a tortilla with some shredded cheese. Add some diced tomatoes, onions, and jalapenos for extra flavor. Fold the tortilla in half and cook it in a skillet until the cheese is melted and the tortilla is crispy. Serve with some salsa and sour cream for dipping.