This casserole comes from the "Los Barrios Family Cookbook" and although it is tasty with just plain chicken, it is elevated to sublime using Canary Girl's Chicken Verde. Just make sure you drain any excess liquid off the chicken. Assemble the dish right before baking -- if you do it in advance, the sauce may make the tortilla strips soggy. You can buy green tomatillo sauce in cans, but I have also posted Los Barrios recipe.