Ultimate Chopped Italian Sandwich (Fast Deli-Style Dinner)

Ingredients

• 1/2 cup (115 g) mayonnaise
• 2 tablespoons extra-virgin olive oil
• 1 1/2 tablespoons red wine vinegar
• 1 teaspoon Dijon mustard
• 1 teaspoon dried oregano
• 1/2 teaspoon garlic powder
• 1/4 teaspoon red pepper flakes
• 1/4 teaspoon kosher salt, plus more to taste
• 1/4 teaspoon black pepper
• 4 Italian sub rolls or hoagie rolls, split
• 3 cups (210 g) finely shredded iceberg lettuce, very dry
• 6 oz (170 g) thin-sliced deli ham
• 4 oz (115 g) thin-sliced Genoa salami
• 3 oz (85 g) sliced pepperoni
• 5 oz (140 g) sliced provolone cheese
• 1 cup (150 g) seeded and chopped tomatoes
• 1/3 cup (50 g) finely chopped red onion
• 1/3 cup (55 g) chopped banana peppers or pepperoncini
• 2 tablespoons grated Parmesan cheese