Add all the salad base ingredients to a large bowl: shredded lettuce, cherry tomatoes, red onion, pepperoncini, and castelvetrano olives.
Add the diced ham, turkey, salami, and provolone.
In a small bowl or jar, whisk the dressing: olive oil, red wine vinegar, oregano, Dijon, grated garlic, salt, pepper, chili flakes, and Parmesan.
Pour the dressing over the salad and toss well to combine.
Chill for at least 15 to 20 minutes so the flavors meld, then serve in a big tub with crackers, chips, or bread for scooping.