Place the warm spaghetti, Parmesan cheese and egg in a bowl and toss to combine.
Spread in a 9 inch pie plate, pressing up the side to form a shell.
Brown the ground beef in a skillet, stirring until crumbly; drain.
Combine the ground beef and pasta sauce in a bowl and mix well.
Spread the meat mixture evenly in the spaghetti shell.
Sprinkle with the mozzarella cheese.
Bake at 350 degrees for 30 minutes or until heated through.
Let stand at room temperature for 5 minutes before cutting into wedges.