Cook pasta according to package instructions. Drain and rinse with cold water to cool down.
Once the pasta is cool, transfer it to a large mixing bowl. Add pepperoni, black olives, tomatoes, green bell pepper, mozzarella cheese, and Italian dressing. Toss to combine. Refrigerate until ready to serve.
Before serving, give it a good toss to make sure the dressing is coating everything. Sprinkle with fresh cracked black pepper.