1 (10 oz.) pkg. sliced pepperoni (or cubed)
1 onion, chopped
1 bell pepper, diced
1/2 stick butter
6 oz. vermicelli, cooked and drained
4 oz. grated Swiss cheese
1 lb. Mozzarella cheese
16 oz. spaghetti sauce (Prego mushroom is good)
1/2 tsp. oregano
1/2 tsp. fresh basil
salt, pepper, garlic powder
fresh grated Parmesan, optional

Sauté onions and pepper in 1-1/2 tbsp. butter until soft.

Grease 9 x 13 dish. Place butter tossed spaghetti on bottom. Cover with sauce. Then add - in order - 1/2 swiss cheese, 1/2 pepperoni, 1/2 mozzarella, all mushrooms, onions, and green pepper. Sprinkle with the fresh basil and oregano. Top with remaining pepperoni and cheeses.

Bake at 350°F (covered with foil) for 35-40 minutes.