Baked Spaghetti with Italian Sausage

1/2 lb spaghetti
1/2 lb Italian sausage
1 jar (14oz) spaghetti sauce
1 egg, beaten
1 1/2 cup shredded mozzarella cheese (divided)
1/4 cup grated Parmesan cheese

Cook pasta as directed. Remove casing from sausage and brown and crumble in medium skillet on medium heat. Drain. Add spaghetti sauce and simmer 5 minutes.
Drain pasta.
Beat egg in a large bowl and add 1 cup of mozzarella and the Parmesan cheese. Stir. Add drained pasta. Toss to coat. Place in 8x8 in dish sprayed with cooking spray.
Top with sausage mixture and remaining mozzarella. Bake at 375 degrees for 15 minutes or til heated thru. Let stand five minutes before serving.