Get a large skillet and with a medium heat, cook altogether the beef and onion until it is no longer pink and drain.
Stir it in the dressings, sour cream, taco seasoning, cumin, salsa and corn.
Put a layer of meat mixture on the bottom of 2 pints baking dish, then sprinkle it with some grated cheese.
Put a flour tortilla on top of the meat mixture.
This time, layer the meat mixture and cheese with half and do as many layers as you like.
On the last layer, put a lot of grated cheese.
If all done, bake it within 20-30 minutes at 350° temperature.
After this, wait for 5 minutes before you top it with tomato and lettuce. Serve and enjoy!