1 lb. ground beef
1/2 c. finely chopped onion
1 (15 1/2 oz.) jar spaghetti sauce
1/2 c. grated Parmesan cheese
8 lasagna noodles, cooked and drained
1 1/2 c. (6 oz.) shredded Mozzarella cheese

Brown meat; drain. Stir in onions; cook until tender. Stir in 1/2 cup sauce and 1/3 cup Parmesan cheese. Cover each noodle with approximately 1/3 cup meat mixture; roll up, starting at narrow end. Place, seam side down, in 12 x 8 inch baking dish. Spoon remaining sauce over noodles. Sprinkle with Mozzarella cheese and remaining Parmesan cheese. Bake at 350 degrees for 30 minutes or until thoroughly heated.