To make this qualify for a "Meatless Monday" dinner, fill with refried pinto beans, cheese and chilies. To make it gluten-free, use your favorite gluten-free tortillas. Resist the temptation to buy pre-shredded cheese that's coated with anti-caking powder -- grating your own cheese is the only way to go. For the shredded chicken, use a whole chicken cooked in a Crock Pot, a rotisserie chicken or a poached whole chicken breast. Serve with queso fresco or sour cream, salsa and guacamole.