In a large frying pan, brown ground beef and onions. Add taco seasoning, pepper, oregano, paprika, parsley and sour cream. Add 1/2 the cheese and 1 bottle of taco sauce mixing well. Place 2 tbsp or more beef mixture on each tortilla shell and roll up. Place seam side down in 9x13 casserole dish. Top with remaining cheese and the second bottle of taco sauce. Bake for 15 minutes, or until cheese melts and is heated through.