Brown ground beef and chopped onions in large skillet; brown 10 to 12 minutes or until thoroughly cooked, stirring constantly. Drain well and rinse with warm water to remove all fat; return beef/onions to skillet.
Add corn, black beans, tomatoes, chilies/jalapenos and taco seasoning mix; mix well. Reduce heat; simmer 5 minutes.
Meanwhile spray 12×8-inch (2-quart) baking dish with nonstick cooking spray. Cut each tortilla in half; place 8 halves in bottom of sprayed baking dish, overlapping slightly.
Spoon half of beef mixture evenly over tortillas. Spoon sour cream over beef mixture; spread evenly. Top with remaining 8 tortilla halves and remaining beef mixture. (Cover tightly with foil & Freeze for later
