Bring a large pot of salted water to a rolling boil. Add the tortellini and cook according to the package instructions, usually around 5 to 10 minutes, until al dente. Drain and rinse with cold water.

In a mixing bowl, combine diced salami, cubed mozzarella, halved cherry tomatoes, sliced cucumber, chopped red bell pepper, and finely diced red onion. If using, add olives.

Gently fold the cooled tortellini into the salad ingredients. Drizzle with Italian dressing and toss to combine.

Season with salt and pepper to taste. Cover and chill in the refrigerator for 10 minutes to allow flavors to meld.

Garnish with fresh basil leaves before serving. Serve cold as a side dish or light meal.