Cook meat and chopped onion in skillet until done; drain. Partly crush the Doritos in an 8x12 baking dish. Spread the meat mix over this.
Combine soups with 1/2 can water and pour over the meat. Chop the green chilies over the top and cover with enchilada sauce. Shred the cheese over the top. Bake 35-40 minutes in a preheated 350-degree oven.