Preheat your oven to 400°F (200°C) and prepare a baking sheet lined with parchment paper.

In a large mixing bowl, combine ground beef, breadcrumbs, grated Parmesan cheese, finely chopped onion, minced garlic, chopped parsley, salt, and pepper. Add the large egg and mix gently.

Use a cookie scoop to portion out the mixture and roll each into a meatball.

Place the rolled meatballs onto the prepared baking sheet, spaced evenly apart.

Bake for 18-20 minutes until browned and cooked through to an internal temperature of 165°F (74°C).

Remove from the oven and let cool for a couple of minutes before serving.