Preheat oven to 350 degrees F
Sautee onion in a small amount of oil until translucent
Add in chilies, soups, chicken and evaporate milk
Grease a 9x13 baking pan with non-stick spray
Tear bite sized pieces of corn tortillas and make a single layer on the bottom of the baking dish
Pour a layer of soup mixture on top of tortillas
top with a layer of shredded cheese
Repeat layers until you finish with cheese
Bake uncovered 35 minutes at 350. Let set for a few minutes before serving.