Enchiladas made with corn tortillas

My good friend and I got together today to make freezer meals. This is what she made. Just off the top of my head this is how she made it.

In a pot on the stove she made a basic white sauce:
Equal parts of flour and butter. (About 2 Tbsp. butter, 2 Tbsp. flour)
Stir and cook for about 3 minutes.

Add 2 C. milk. Or 1 C. chicken broth and 1 C. milk,
1 can cream of mushroom soup,
1/2 C. green chilies,
Add 2 C. cooked chicken, chopped in bite size pieces. 
Put some sauce in the bottom of the pan, put down corn tortillas. Then cheese. Layer again. Sauce, tortillas, cheese.
Bake in a glass baking dish at 350 degrees for about 40 minutes, or until heated through. 

Let me know if this is wrong, Yvonne!
Thanks!