Brown ground beef and onions together for about 10 to 12 minutes, drain.
Add corn,beans,tomatoes and mexican vegetable dip mix, mix well and simmer for 5 minutes.
Spray 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 degree F. oven and bake for 25 minutes remove from oven and 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. Your famiily will enjoy this amazing mexican beef casserole. It is just the right thing to hit the spot on a "chili" night!
*you can subsutitue 1 pound of ground chicken or turkey for a lighter casserole!