Feel free to use any meat or meat substitute for the filling. The cilantro is optional if you don't like cilantro. If you don't have a food brush you can use your fingers to rub oil on the corn tortilla shells. You can substitute flour tortillas but I haven't tested the recipe with flour tortillas and can not guarantee the same crispy result. You can store any left over canned chipotle chilis in a Ziplock or freezer safe container and keep in the freezer for up to 3 months.