This cheesy quesadilla is a quick and easy lunch or snack option. Heat a non-stick pan over medium heat and place a tortilla in the pan. Add shredded cheese and your favorite toppings such as cooked chicken, beans, and vegetables. Fold the tortilla in half and cook for 2-3 minutes on each side until the cheese is melted and the tortilla is crispy. Serve hot with salsa and sour cream.