Cook the bacon in a skillet over medium heat until crispy, about 8-10 minutes. Transfer to paper towels to drain and chop.

Boil a large pot of salted water, add frozen tortellini, and cook according to package instructions until al dente, about 3-5 minutes. Drain and rinse.

In a mixing bowl, whisk together mayonnaise, red wine vinegar, and seasonings to make the dressing.

Combine the dressing, tortellini, bacon, Parmesan, red onion, and pepperoncini in the bowl. Toss gently.

Cover and chill in the refrigerator for at least 2 hours before serving.