Preheat oven to 350 degrees F. In large pan brown ground beef with onion. Drain off grease. Add taco seasoning.
In the meantime while browning beef - in medium sauce pan combine soups (undiluted), enchilada sauce, and green chiles - heat. Add half of the soup mixture to the ground beef.
Grease a 9 x 12 pan (can use larger pan). Put a layer of tortillas (made to fit) in bottom of pan. Then add half of the ground beef mixture on top of tortillas. Then a layer of cheese. Repeat with the tortillas, ground beef mixture, and cheese. Put another layer of tortillas. Then pour the pan of left soup mixture on top. Top off with remaining cheese.
Bake for 30 minutes or until the cheese is melted and bubbling. Let sit for a couple of minutes. Serve with a spoonful of sour cream and green onions on top.