Spaghetti Salad

1 pound spaghetti, cooked and broken into pieces
1 bottle Salad Supreme? seasoning
1 medium Bermuda onion, chopped
2 avocados, sliced
1 to 1 1/2 cups fresh mushrooms, sliced
1 large bottle Italian dressing
1 large green bell pepper, chopped
2 small cans black olives, sliced

Cook and drain spaghetti; marinate overnight with salad dressing, Salad Supreme?, onions, peppers and mushrooms. Add avocados, tomatoes and olives just before serving.