In a skillet over medium heat, add diced bacon and cook for about 5–7 minutes until crispy, stirring occasionally.

Bring a large pot of salted water to a boil, then add frozen cheese tortellini and cook according to package directions, usually around 3–5 minutes, until al dente.

In a large mixing bowl, combine mayonnaise, red wine vinegar, salt, oregano, Italian seasoning, garlic powder, and red pepper flakes. Whisk everything together for about 1–2 minutes until smooth.

Add the cooled tortellini, chopped pepperoncini, grated Parmesan cheese, chopped red onion, diced tomatoes, and crispy bacon into the bowl with the dressing. Gently toss until evenly coated.

Cover and refrigerate for at least 2 hours to allow flavors to meld.

Before serving, stir gently and drizzle reserved dressing if needed.