A quesadilla is a Mexican dish made by filling a tortilla with cheese and other ingredients, then folding it in half and heating it until the cheese melts. The word comes from Spanish: queso means cheese, and tortilla is a thin, flat bread made from corn or wheat flour.

To make a quesadilla, you place shredded cheese on one half of a tortilla, add optional fillings like cooked chicken, beans, or vegetables, then fold the tortilla over and cook it on both sides in a pan or on a griddle. The heat melts the cheese and creates a warm, crispy pocket. You can cut the finished quesadilla into triangular wedges, like slices of pizza, making it easy to eat with your hands.

Quesadillas are popular both in Mexico and around the world because they're simple, delicious, and adaptable. You can fill them with almost anything you like. Some people enjoy them plain with just cheese, while others add ingredients like peppers, onions, or beef. They're often served with sides like salsa, guacamole, or sour cream for dipping.