preheat oven to 400º

in large skillet, brown beef with the onion.

stir in salsa, beans, dressing, sour cream, corn taco seasoning, and cumin.

spoon meat mixture along bottom of dish. sprinkle with cheese. place tortilla on top.

repeat for as many desired layers. last layer should have a generous amoutnt of cheese on top.

cover with foil and bake 25 minutes. until hot and bubbly.

let stand for 5 minutes. then top with letuce, tomato, and cilantro.