A quesadilla is a Mexican dishconsisting of a tortilla that is filled primarily with cheese, and sometimes meats, spices, and other fillings, and then cooked on a griddle or stove. Traditionally, a corn tortilla is used, but it can also be made with a flour tortilla. A full quesadilla is made with two tortillas that hold a layer of cheese between them. A half is a single tortilla that has been filled with cheese and folded into a half-moon shape. The quesadilla has its origins in colonial Mexico. The quesadilla as a dish has changed and evolved over many years as people have experimented with different variations of it. Quesadillas are frequently sold at Mexican restaurants all over the world