1 (4 oz.) pkg. sliced pepperoni, boil in 5 inches of water and drain
1 onion, chopped fine, sauteed in 1 tbsp. butter
6 oz. thin spaghetti, cooked
4 oz. Swiss cheese, grated
8 oz. sliced Mozzarella cheese
2 (8 oz.) cans tomato sauce
1 (4 oz.) can mushrooms
1/2 tsp. oregano
1/2 tsp. basil

Melt 1/4 cup butter in 11 x 7 inch pan. Toss spaghetti in it. Pour over 1 can sauce. Layer 1/2 meat and cheeses, then all of mushrooms, onions and seasonings. Add 1 can tomato sauce, the rest of layers of meat, cheese and end with Mozzarella. Bake at 350 degrees for 20 to 25 minutes.