Directions
Step 1
Preheat the oven to 375°F (190°C).
Step 2
In a mixing bowl, combine the ground beef, breadcrumbs, milk, egg, Parmesan cheese, garlic, parsley, salt, and pepper. Mix everything together until it's well combined.
Step 3
Using your hands, form the mixture into 12 to 16 meatballs.
Step 4
Place the meatballs on a baking sheet and bake in the oven for 15 to 20 minutes or until they are cooked through and no longer pink in the center.
Step 5
While the meatballs are baking, slice the sub rolls in half and place them on a baking sheet.
Step 6
Spread the marinara sauce on one side of each sub roll.
Step 7
When the meatballs are cooked, remove them from the oven and place 3 to 4 meatballs on each sub roll.
Step 8
Top the meatballs with shredded mozzarella cheese.
Step 9
Place the sub rolls in the oven and bake for an additional 5 to 7 minutes or until the cheese is melted and bubbly.
Step 10
Serve hot with optional toppings if desired. Enjoy your delicious meatball sub!