Chilaquiles is a Mexican dish of fried tortilla chips (totopos) simmered briefly in a chile-based sauce, usually salsa verde or salsa roja, until softened but not mushy. It likely developed as a way to use up stale tortillas and leftover salsa, with roots going back to Mesoamerican cooking. It's typically served for breakfast or brunch, topped with shredded chicken or beef, a fried egg, crumbled queso fresco, onion, cilantro, and crema, with regional variations adding beans, avocado, or chorizo.