In a large pan, cook ground beef, onion, and garlic slowly until meat is browned and onion is tender. Spoon off excess fat. Stir in next ingredients; simmer uncovered for 10 minutes, stirring occasionally. Combine cottage cheese, 1/2 cup of the Parmesan cheese, parsley flakes, salt and oregano. In a 9x13x2-inch baking dish, place half the frozen potatoes; spread with half the meat sauce; add half the mozzarella cheese; spoon on half the cottage cheese mixture. Repeat layers, reserving some of the meat sauce to spread over the entire surface. Sprinkle with 1/4 cup Parmesan cheese. Bake, uncovered, at 350 degrees for 40-45 minutes or until cheese is bubbly in the center. Let stand for 10 minutes before cutting into squares.