Preheat oven to 400°F. Line a baking sheet with aluminum foil and spray with olive oil cooking spray.

In a large bowl, mix ground beef, Italian sausage, egg, breadcrumbs, parmesan, onion, half & half, garlic, Italian seasoning, salt, and pepper until just combined.

Use a cookie scoop to portion out the meat mixture into 15 balls and set aside.

Flatten each meatball slightly and place a mozzarella cube in the center. Fold and roll to enclose the cheese completely in the meat.

Place each stuffed meatball on the prepared baking sheet.

Bake for 20-25 minutes or until meat is cooked through and lightly browned.

Once cooked, let the meatballs rest for 5 minutes, then heat marinara sauce over medium heat.

Serve meatballs topped with sauce and a sprinkle of parsley.