1Brown ground beef and onions together for about 10 - 12 minutes. Drain.
Add corn, beans, tomatoes and taco seasoning. Mix well and simmer for 5 minutes.
2Spray baking dish (2 quart 8x12 inches) Place half of tortillas in bottom. Spoon half of beef mixture on top, place sour cream over beef. Then layer last tortillas and then beef mixture. Place in heated 350 over and bake for 35 minutes.
3Remove from oven and sprinkle with cheese and add sliced jalapeno peppers on top. Cook for another 5 minutes or till cheese is melted. Let stand for 5 minutes and serve.