If you use lasagna noodles instead of flour tortillas, you don't have to pre-cook the noodles. Just add them like you would the flour tortillas. Be sure to cover the dish tightly with foil when you put it in the oven, and cook for 30 minutes covered, 20 minutes uncovered. Test the doneness of the noodles by pushing a toothpick through the center of the dish. If it goes through easily, noodles are cooked and dish is done.