Pre-heat the oven to 375ºF (190 ºC)
Cover the bottom of a casserole dish with the tomato sauce
Display the tortillas in one layer.
Drop in the corn, the beans, the onion and the chicken. Cover with
more tortillas and enchilada sauce. Repeat the layers three times. Top
with plenty of shredded cheddar cheese.
Spoon plenty of béchamel on top and acheddar cheese, and finally decorate with sour cream.
Cook in the oven for 35 minutes.