4 oz. pepperoni, sliced
1 med. onion, chopped
1/2 c. melted butter
8 oz. wide noodles, cooked
1 c. grated Swiss cheese
2 (8 oz.) cans tomato sauce
1/2 tsp. oregano
1/2 tsp. parsley

Mix all ingredients in large bowl. Place in large baking dish. Bake at 350 degrees for 30 minutes.