Perfect Pizza Cassrole

who say's you have to order out?
2 lbs...italian sausage
1 rigatoni noodles (16oz)
1 sm...jar pizza sauce
1 cream of mushroom soup (10.75)can
1 sm.. can of mushrooms
1 package of sliced pepperoni
1 med.. onion diced
1 package of mozzarella cheese (16oz.)

Brown sausageand onions together..
In a cassrole dish layer pasta,pizza sauce,cream of mushroom soup,
and mushrooms...
Top with cheese and pepperoni slices...
Bake at 350 for 30 minutes or until throughly heated....