Preheat Oven: Preheat your oven to 375°F (190°C).

Prepare Meatballs: In a large mixing bowl, combine ground beef, ground pork, breadcrumbs, grated Parmesan, minced garlic, chopped parsley, eggs, salt, and pepper.

Mix the ingredients until well combined. Shape the mixture into meatballs, about 1 to 1.5 inches in diameter.

Bake Meatballs: Place the meatballs on a baking sheet and bake in the preheated oven for 20-25 minutes or until cooked through and browned on the outside.

Warm Marinara Sauce: While the meatballs are baking, heat the marinara sauce in a skillet or saucepan over medium heat. Once heated, add the baked meatballs to the sauce, allowing them to simmer for an additional 5 minutes.

Prepare Sub Rolls: Cut the sub rolls or baguettes in half, leaving one side attached (like a hinge). Place them on a baking sheet.

Assemble Subs: Spoon a generous portion of meatballs and marinara sauce onto each sub roll. Sprinkle shredded mozzarella over the top.

Bake Subs: Place the assembled subs back in the oven for 5-7 minutes, or until the cheese is melted and bubbly.

Garnish and Serve: Remove the subs from the oven and sprinkle with additional Parmesan cheese and fresh basil or parsley.

Serve and Enjoy: Allow the subs to rest for a few minutes before serving. Let your family customize their subs with additional toppings like red pepper flakes or more fresh herbs.