Preheat your oven to 350°F (175°C).

Slice the French bread loaf horizontally and lay it cut-side up on a baking sheet.

In a small bowl, combine softened butter, grated Parmesan, garlic powder, and salt until smooth.

Spread the butter mixture generously over the cut side of the top half of the French bread.

Layer the ham, pepperoni, and salami on the bottom half of the bread, then add thick slices of provolone cheese.

Bake for 8-10 minutes until the cheese melts completely.

For extra crunch, switch to broil for an additional 1-2 minutes.

While baking, whisk together mayonnaise, red wine vinegar, Italian seasoning, salt, pepper, and garlic powder.

In a bowl, combine lettuce, tomatoes, and pepperoncini; drizzle with dressing and toss well.

Assemble the sandwich by piling the dressed salad onto the bottom half, close with the top and press down gently before slicing.