Bring a large pot of water to a boil then add rotini and cook until tender. Drain then rinse under cold water until pasta is cold. Drain very well then add to a large mixing bowl.
To the cooled pasta add tomatoes, cucumber, pepperoni, black olives, 1/3 of the bottle of Italian Dressing, and 1/4 cup Salad Supreme Seasoning then mix to combine. Taste then add more dressing and/or Salad Supreme Seasoning if desired. Serve immediately or refrigerate for up to 2 hours.
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Notes
Because this pasta salad is made with gluten free pasta, it's best eaten right away or chilled for up to 2 hours prior to serving. You may need to toss with additional dressing before serving if chilling first.