Remove tortillas from refrigerator. Heat oven to 375° F. Brown meat & drain. Add corn, salsa, tomato sauce & taco seasoning mix. Simmer, stirring frequently for 5 minutes. In a separate bowl combine cottage cheese, eggs & oregano. Line bottom of greased 13"x9" baking dish with 5 tortillas, overlapping edges. Top with half the meat mixture. Spoon cottage cheese mixture over meat. Arrange 5 tortillas over cheese mixture. Spread remaining meat mixture over all & top with shredded cheese. Bake for 30 minutes or until cheese melts and casserole bubbles. Let stand for 10 minutes before cutting & serving.