Prepare the Meats and Cheeses: Thinly slice all your chosen Italian deli meats and provolone cheese. The thinner the slices, the easier they are to chop uniformly.
Chop Everything: In a large bowl, combine the thinly sliced meats and cheeses. Add the chopped pepperoncini peppers, Kalamata olives, red onion, fresh parsley, and fresh basil.
Make the Dressing: In a small bowl, whisk together the mayonnaise, red wine vinegar, Dijon mustard, dried oregano, and garlic powder. Season with salt and pepper to your liking. Taste and adjust seasonings as needed.
Combine and Toss: Pour the dressing over the chopped meat, cheese, and vegetable mixture. Gently toss everything together until well combined and evenly coated. Ensure all ingredients are distributed throughout the mixture.
Chill (Optional but Recommended): For best flavor, cover the bowl and refrigerate for at least 30 minutes to allow the flavors to meld. This step is optional but highly recommended.
Serve: Spoon the chopped Italian mixture generously into split hoagie rolls, onto slices of crusty Italian bread, or serve alongside pieces of focaccia. You can also serve it as a salad on its own.