Skillet Lasagna - cooking recipe

Ingredients

10 lasagna noodles (about 1/2 of 16 oz. pkg.)
1 lb. ground beef
1 small onion
1 (14 to 15 1/2 oz.) jar spaghetti sauce
1 (15 oz.) container Ricotta cheese
1 egg
1/4 tsp. salt
1/4 tsp. pepper
1 (4 oz.) pkg. shredded Mozzarella cheese

Preparation

Using very hot tap water, prepare lasagna noodles as label directs; drain.