Brown beef and onion; drain.
Add taco seasoning with some water and stir in
Mix soup and sour cream in a separate bowl.
Spread 1/2 sour cream mixture in the bottom of
a casserole dish.
Tear up 3 tortillas and spread over sour cream
Put 1/2 the meat bean mixture over that.
Add a layer of cheese.
Repeat the layers.
Sprinkle cheese over the top and bake,
uncovered, at 350°F for 20-30 minutes.