Preheat your oven to 375°F and line a baking sheet with parchment paper.
In a large bowl, combine the ground beef, breadcrumbs, marinara sauce, shredded parmesan, parsley, and egg. Mix gently until everything is evenly incorporated, don’t overwork the meat.
Divide the mixture into 4 equal portions. Form each one into a small oval loaf and flatten slightly so they cook evenly. Place the loaves on the prepared baking sheet.
Bake for 25 minutes, or until the internal temperature reaches 160°F.
Brush the tops with ketchup or BBQ sauce, if desired. Garnish with extra parsley and serve warm.