Preheat the oven to 375°F. In a large bowl, combine the ground beef, ground pork, breadcrumbs, egg, milk, diced onion, minced garlic, Italian seasoning, salt, and pepper. Mix until evenly combined.
Place half the meat mixture in a loaf pan and press it flat. Lay the Italian sausage links in a single row down the center. Cover with the remaining meat mixture and seal the edges.
Bake the meatloaf for 50 to 55 minutes until the internal temperature reaches 160°F. Let it rest for 5 minutes before slicing.
While the meatloaf bakes, bring the chicken broth to a boil in a saucepan. Slowly whisk in the cornmeal. Reduce heat and cook, stirring often, for 15 minutes until thick.
Remove the polenta from heat. Stir in the Parmesan, butter, and heavy cream until smooth. Season with salt and pepper if needed.
Slice the meatloaf and serve portions over scoops of polenta. Sprinkle with fresh parsley.