1 lb. ground beef
1/2 c. chopped onion
1 c. Parmesan cheese, grated
1 egg, beaten (optional)
1 tsp. oregano leaves
1 tsp. garlic salt
16 manicotti shells, uncooked
2 (16 oz.) cans tomatoes
1/2 c. water
8 oz. pkg. Mozzarella cheese, shredded

Brown meat; drain. Add onion; cook until tender. Stir in 1/2 cup Parmesan cheese, egg, and seasonings. Fill manicotti shells; place in 13 x 9 inch baking dish. Pour combined tomatoes, tomato sauce, and water over manicotti. Sprinkle with remaining Parmesan cheese. Cover with aluminum foil; bake at 350 degrees for 1 hour. Top with Mozzarella cheese; continue baking until melted.