Start by slicing the sourdough bread into thick pieces if not pre-sliced. Gather your deli meats and thinly slice your roasted red peppers to ensure everything is ready for layering when making your Grinder Grilled Cheese Sandwich.

In a mixing bowl, combine the shredded mozzarella, provolone, and grated Parmesan cheese until they are evenly mixed. Set aside for easy access later.

Spread mayonnaise evenly on one side of each slice of bread, followed by sprinkling Italian seasoning over it.

On the unspread side of two slices of bread, layer half of the cheese mixture evenly.

Layer thinly sliced deli meats evenly over the cheese, then scatter the roasted red peppers on top.

Sprinkle the remaining cheese mixture on top of the deli meats and peppers, then place the other two slices of bread on top, mayo side up.

Preheat a skillet over medium heat for about 2–3 minutes. Place the sandwiches in the hot skillet and grill for approximately 3–4 minutes until golden brown.

Gently flip the sandwiches and continue to grill for another 3–4 minutes until fully melted.

Let the sandwiches rest for 1 minute before slicing to ensure the cheese settles.

Slice each sandwich in half to reveal the melty layers within. Serve hot alongside marinara or your favorite dipping sauce.