Boil pasta according to package directions. Immediately run under cold water to stop cooking process and set aside.
In a large bowl, combine chopped onion, chopped bell pepper, broccoli florets, halved tomatoes, cubed grilled chicken, (or salami or shrimp), cubed mozzarella and pasta.
Add salt, pepper and oregano.
Mix in Italian dressing and black olives. Refrigerate until serving. Lasts for several days in the refrigerator.