From what I have seen. My mother do in the kitchen.
It is an easy dish. Any additional notes are from my cabesa.
Here is a recipe.
Following these instructions here. Simple just add the shredded chicken before placing in the oven.
http://www.elise.com/recipes/archives/00...iladas.php
You dont need the tomatoe paste or chopped tomatoes from receipe above unless you want all that extra crap on top

. The receipe linked is for more of a cassorole without meat.
For the best flavor, use thighs or drumsticks even though its harder to remove the meat from the bone. I dont think breast meat is good in this receipe, unless you can get the meat really soft.
Just rinse the chicken and toss it in a pot with water, bones and skin, thighs is the easiest to peel the meat from the bone.
Boil a lot of chicken (cant give you an exact poundage, depends on what each person is going to eat,) with half an onion and salt for flavor.
To cook the tortillas.
Low heat. Just place a little canola oil in a frying pan, enough to cover the tortillas. Once soaked, about a minute or two on each side. Remove the "cooked" tortilla from the frying pan and place on a plate with paper towels to soak up any excess oil. You dont want the tortilla to get hard. You just want it soaked and a little cooked in the oil(still flexible).
Make burritos with the shredded chicken and the cooked tortillas. Place them in a pyrex or similar baking dish and make one layer as noted in the picture from recipe. Sprinkle with (whatever topping you want, onions, bell peppers, chopped tomatoes) sauce, shredded cheese on top and place in the oven. After cheese has melted remove from the oven and serve with chopped lettuce on top and some sour cream.
**Make your own green or red sauce(if you are in a hurry buy it premade). I like both. But most people prefer the red sauce.
This is what I have used for sauce, its ok.
The above recipe is simple. To make it even simpler, just layer the cooked tortillas, like if you where going to make lasagna (spelling?)
cooked tortilla, chicken, sauce, cheese, other toppings, tortilla chicken sauce cheese , other toppings. Bake to melt the cheese and you are done.
Good luck.
Carm