Cook the pasta as per the package instructions. Drain the pasta into a colander and then dump it back into the pot. Add 1 cup of the Italian dressing and stir until the pasta absorbs the dressing. Cover the pot with a lid and cool for 30 minutes at room temperature.
In a large bowl add the pasta, mozzarella cheese, tomatoes, black olives, green bell pepper and the remaining 1 cup of Italian dressing and toss gently, then refrigerate at least one hour.
Season with salt and pepper, and then transfer the salad to a serving bowl. Serve.