Preheat the broiler to 400°F and line a baking sheet with parchment paper.
Slice the Italian loaf in half and place on the baking sheet.
Layer the deli meats on the bottom half and the cheeses on the top half.
Broil for 3 to 5 minutes until the cheeses melt and the bread is crispy.
In a mixing bowl, whisk mayonnaise, Dijon mustard, vinegar, relish, and seasoning, adding salt and pepper to taste.
Add in banana peppers, red onion, and iceberg lettuce and toss to combine.
Remove the bread from the oven. Layer the salad dressing on the meat and add tomato slices and grated Parmesan.
Slice into four equal portions and serve.