Start by preheating your oven to 350º. In a large skillet cook the ground beef and onions. Drain any extra grease. Add the taco seasoning, corn, black beans, salsa and chiles. Remove from heat. Stir in the sour cream and one cup of cheese.
Place two cups of crushed chips into the bottom of a 9x13-inch baking dish sprayed with nonstick cooking spray. Pour meat mixture overtop, Add remaining cheese and chips over top and bake for 10 minutes until cheese is melted.