Cook the Bacon: Heat a skillet over medium heat, add bacon slices in a single layer, fry for 6 to 8 minutes until crispy, and chop into bite-sized pieces.

Prepare the Tortellini: Boil salted water, add frozen cheese tortellini, cook for 3 to 5 minutes, drain, and rinse under cold water.

Make the Dressing: Combine mayonnaise, red wine vinegar, garlic powder, oregano, Italian seasoning, and red pepper flakes in a bowl. Whisk until smooth.

Combine Ingredients: In a large bowl, combine cooled tortellini, crispy bacon, pepperoncini, chopped red onion, sliced tomatoes, and grated Parmesan cheese. Drizzle dressing and fold gently.

Chill the Salad: Cover and refrigerate for at least 2 hours to meld flavors.

Serve: Stir salad before serving, enjoy cold or at room temperature.