1break spagetti noodles into 1 in pieces. preheat oven to 425 degrees.
2in a large skillet cook ground beef and onion, until onion is tender and beef is no longer pink. drain grease from beef and return to skillet. add tomatoes, tomatoe sause, and worcestershire sauce. simmer 15 minutes.
3while the meat mixture simmers, boil spagetti noodles till tender, and drain add to meat mixture.
4in a loaf pan place half of mixture, top with american slices. add remaing mixture and top with shredded mozzerella.
5bake 15-20 minutes, or untill cheese is golden and casserole is bubbly. let sit for 5 minuted before serving. serve with garlic bread and salad.