If you want to make a great quesadilla with cheese you need to pick out some really good cheese. Cheese like Oaxaca cheese, Manchego cheese, Asadero cheese and Chihuahua cheese work great. Mozarella can also be used. You can test and try which one works the best for you. We prefer Manchego because it is widely available in the US and Europe and is made from sheeps milk which is better for our stomachs.