Cook the Bacon: Heat a skillet over medium heat and add sliced bacon. Cook for about 8-10 minutes or until crispy and golden brown. Transfer to a paper towel-lined plate to drain, then chop into small pieces.

Prepare the Tortellini: Boil water in a large pot, add salt, and cook frozen tortellini according to package instructions for 3-5 minutes until al dente. Drain and rinse under cold water.

Make the Dressing: In a mixing bowl, combine mayonnaise, red wine vinegar, salt, oregano, Italian seasoning, garlic powder, and red pepper flakes. Whisk until smooth.

Combine Salad Ingredients: Fold the cooled tortellini, chopped bacon, sliced pepperoncini, grated Parmesan, chopped red onion, and diced tomatoes into the dressing. Toss lightly.

Chill and Serve: Cover the bowl and refrigerate for at least 2 hours to allow flavors to meld. Toss before serving.