Preheat oven to 400 degrees. Line a large deep sheet pan with parchment paper.
In a large mixing bowl, combine meatloaf mixture ingredients (ground beef, ground pork, bread crumbs, milk, egg, onion, salt, pepper, nutmeg, allspice, and parsley).
Form 1 1/2 inch round meatball shapes and place on prepared sheet pan very close together. Bake in preheated oven for 15-20 minutes until meatballs are cooked through and no longer pink in the center. Remove from sheet pan and place on a paper towel lined plate to drain excess grease.
While the meatballs are baking, heat 4 TBS butter in a large Dutch oven or soup pot until it starts to sizzle over medium high heat. Whisk in the flour and stir until butter starts to brown. Add in chicken broth, beef broth, heavy whipping cream, sour cream, soy sauce, Worcestershire sauce, Dijon mustard, and black pepper. Stir well to combine. Add salt, if needed.
Bring soup to a boil over high heat. Stir in uncooked noodles. Place a lid on partially and cook over medium heat until noodles are tender about 10 -12 minutes.
Stir in meatballs and additional parsley. Serve in bowls with garnishes. (cranberry sauce or lingonberry jam, sour cream, and parsley)