Preheat oven to 375 degrees F. Brown ground beef in a large skillet and drain. Add corn, tomato sauce, picante sauce, chili powder, cumin. Simmer, stirring frequently for about 5 minutes. Combine cottage cheese, eggs, Parmesan cheese, oregano and garlic salt. Mix well. Arrange 6 tortillas on bottom and sides of lightly greased 13x9x2 inch baking dish, overlapping as necessary. Top with 1/2 the meat mixture. Spoon cheese mixture over meat. Arrange remaining 6 tortillas over cheese. Top with remaining meat mixture. Bake in preheated oven about 30 minutes. Remove from oven and top with shredded cheddar cheese. Let stand 10 minutes before serving.