Cook the diced bacon in a large skillet over medium heat for about 6-8 minutes until crispy. Transfer to paper towels to drain.

Bring a pot of salted water to a boil, then add the tortellini and cook according to package instructions, about 3-5 minutes. Drain and rinse under cold water.

In a mixing bowl, combine mayonnaise, red wine vinegar, garlic powder, Italian seasoning, crushed red pepper, and salt. Whisk until smooth.

Add cooled tortellini, pepperoncini, cherry tomatoes, red onion, bacon, and Parmesan cheese to the dressing. Gently fold together.

Cover and refrigerate for at least 1 hour to let the flavors meld.

Before serving, stir and adjust seasoning if needed. Serve chilled.