Pizza Casserole

Directions

1. 1
   Cook spaghetti 10 minutes; drain.
2. 2
   Toss with butter.
3. 3
   Cook pepperoni in water to cover for 5 minutes; drain.
4. 4
   Saute onion in remaining butter until translucent.
5. 5
   In large casserole layer ingredients in this order:
6. 6
   1/2 spaghetti, 1 can tomato sauce, 1/2 Swiss cheese, 1/2 spices and salt, 1/2 onions, mushrooms and pepperoni and 1/2 Mozzarella cheese.
7. 7
   Repeat with second layer. Bake 30 minutes at 350° or until brown and bubbly.