In a large bowl, combine the shredded iceberg lettuce, sliced deli ham, salami, provolone cheese, thinly sliced red onion, and sliced pepperoncini peppers.
In a small bowl, whisk together the mayonnaise, red wine vinegar, dried oregano, garlic powder, salt, and black pepper until well combined.
Pour the dressing over the salad ingredients and toss gently to coat everything evenly.
Serve immediately or chill for a short time to allow flavors to meld.
Notes
This salad is best served fresh but can be made a few hours ahead. If making ahead, you might want to keep the dressing separate and toss just before serving to prevent sogginess.