Preheat your oven to 400°F (200°C).

In a large bowl, combine ground beef, breadcrumbs, Parmesan, parsley, egg, garlic, salt, and pepper.

Mix the ingredients until well combined.

Form the mixture into 1-inch meatballs and place them on a baking sheet.

Bake in the preheated oven for 20 minutes, or until browned.

While the meatballs are baking, heat marinara sauce in a saucepan.

Once the meatballs are cooked, add them to the marinara sauce.

Simmer for 5 minutes to allow the flavors to meld.

Serve the meatballs with pasta or on a sub roll.

Garnish with extra parsley and Parmesan if desired.