Brown meat with onions and garlic. Drain and cool. Stir in bread crumbs, cheese, parsley, and egg. Season with salt and pepper. Cook shells until tender in boiling water. Drain and cool on cookie sheet. Stuff shells with meat mixture. Spoon 1/4 sauce over 9x13x2 inch baking dish. Place filled shells in dish, side by side. Pour remaining sauce over shells. Sprinkle with Parmesan cheese. Bake for 20-25 minutes at 350 degrees.