Cook the Pasta: Bring a large pot of salted water to a boil. Add the pasta and cook according to package instructions until al dente, about 8-10 minutes. Drain and rinse with cold water.

Prepare the Ingredients: Wash and chop the mixed vegetables into bite-sized pieces, and slice or cube the string cheese.

Combine the Salad Ingredients: In a large mixing bowl, mix the cooled pasta, chopped vegetables, and pepperoni.

Dress the Salad: Drizzle Italian dressing and olive oil over the salad mixture, then toss to coat all ingredients.

Chill Before Serving: Cover and refrigerate for at least 10 minutes to let flavors meld.