Form those legendary meatballs! In a bowl, combine your lean ground beef, breadcrumbs, whisked egg, finely chopped onion, minced garlic, Italian herbs, salt, and pepper. Mix well, then shape into 4 generous meatballs. In a pan with 1 tbsp olive oil, brown them on all sides for 5-6 minutes. Once beautifully browned, remove them from the pan for a moment.

Get that sauce simmering! Place the same pan back on medium heat. Pour in your marinara sauce, then carefully add your browned meatballs. Let them simmer gently for 5-10 minutes, allowing those flavors to meld beautifully.

Prep your perfect sub! Grab your New York Bakery Original Sub and split it in two. Lightly toast your sub roll until it's golden and perfectly crisp – just how you like it for that authentic New York bite.

Build your masterpiece! Spoon those rich meatballs and sauce generously onto the bottom half of your toasted sub. Pile it high with shredded mozzarella cheese. 

The grand finale! Place your open-faced sub under a hot grill for 2-3 minutes, or until that mozzarella is bubbling and beautifully melted. (Optional: add a few basil leaves for garnishing) Serve warm, and get ready to dig into a true taste of New York!