Preheat the oven to 200°C (400°F) and line a baking sheet with parchment paper

In a large mixing bowl, combine ground beef and Italian sausage

Add breadcrumbs, grated Parmesan, chopped parsley, eggs, minced garlic, salt, and black pepper

Mix gently with your hands until just combined — do not overmix

Scoop and roll the mixture into evenly sized meatballs, about 4–5 cm in diameter

Place meatballs on the prepared baking sheet, spacing them slightly apart

Bake for 18–22 minutes, until cooked through and lightly golden on the outside

Remove from oven and let rest for a few minutes

Serve warm on their own or with marinara sauce