Spray 9x13 inch pan with non stick spray. Brown hamburger, add onion and cook until onion is translucent. Place half the tortillas in bottom of pan, spread to fit as well as possible. Add drained hamburger and spread evenly. Pour undrained beans evenly over hamburger and add sliced or grated cheese over beans.
Place remainder of the tortillas over the cheese. Mix the tomatoes, chicken soup, salsa and pour evenly over tortillas.
Bake for 1 hour at 350 degrees. This freezes well. You should not use an aluminum pan since the tomato and chilies will eat through the pan-that is experience talking!
From: Glorious Grub Cookbook By. Joan Stewart