1 bag frozen onion
3lb ground beef
2 cans refried beans
2 cans cream of mushroom soup
4 oz sour cream
Shredded cheese (I used Colby jack)
2 packets taco seasoning
Brown the beef, drain, and add the frozen onion. Add taco seasoning. Add refried beans. Meanwhile, mix cream of mushroom and sour cream together. Layer half of the sour cream/cream of mushroom mix in the bottom of the casserole dish. Add torn up (or cut up) tortillas. Add half the meat/bean mixture. Add layer of cheese. Repeat the layers again. Finish with a good layer of cheese. Bake a 350 for 30 minutes.
I just layer the tortillas whole now. Also, for some texture maybe add some tortilla chips to the top in the last 5 minutes.