Make the chili per instructions on the Chili Seasoning Mix package EXCEPT break the meat up well, use more onion and omit the water.
Spray a 13x9 baking dish with non-stick spray. Line bottom with corn tortillas cutting them in half so the straight edges lay around the bottom of the pan nice. Make sure to cover the whole bottom cutting the tortillas in pieces to cover the holes.
Add layers on top of the tortillas in this order. Chili, cheese, tortillas, chili. You will probably not use all of the tortillas. Better to have too many then not enough.
Top with corn chips and the rest of the cheese.
Bake at 350 degrees for 30 - 40 minutes or until the cheese has lightly browned on top.