Once cool transfer to a large bowl and gently toss pasta with Italian dressing. Add bell pepper, Parmesan cheese, pepperoni, olives, mozzarella, red pepper flakes and basil. Toss until all ingredients are fully combined.
1/2 cup Italian dressing, 1 large green bell pepper, finely chopped, 1 cup finely shredded Parmesan cheese, 1 (5 oz.) bag mini pepperoni slices, 1 (3.8 oz.) can sliced black olives, 12 oz. fresh mozzarella balls, 1 tbsp. red pepper flakes, 2 tbsp. finely sliced fresh basil