Drain the tortellini immediately once it is done cooking. Transfer it to a large serving bowl and add the bell pepper, onion, pepperoni, and cheese. Mix to combine.
Next, add 1 cup of Italian dressing, as well as the pepper and Italian seasonings. Mix well, making sure to evenly coat the tortellini mixture with the seasonings and dressing. Taste and make adjustments if desired.
Cover the tortellini salad and move it to the fridge to chill for an hour(overnight preferred).
Before serving, toss the salad, making sure to mix up any dressing that has accumulated on the bottom. Add the reserved 1⁄2 cup ofItalian dressing if necessary, mix well, and serve!
Notes
Make sure everything is cut up into bite-sized pieces.