Prepare the Meatballs: In a large mixing bowl, combine ground beef, ground pork, egg, almond flour, heavy cream, grated Parmesan, onion, garlic powder, salt, black pepper, allspice, and nutmeg. Mix until well incorporated.
Form the Meatballs: Shape the mixture into 1-inch meatballs and place them on a plate. Set aside.
Cook the Meatballs: Heat a frying pan over medium heat. Add the meatballs and cook for about 10-12 minutes, turning occasionally, until browned on all sides and cooked through. Remove meatballs from the pan and set aside.
Make the Creamy Sauce: In the same pan, melt the butter over medium heat. Whisk in the beef broth, scraping up any browned bits from the bottom of the pan. Stir in the heavy cream, Worcestershire sauce, and Dijon mustard. Season with salt and pepper to taste. Continue to cook, stirring frequently, until the sauce thickens, about 8-10 minutes.
Combine and Serve: Return the meatballs to the pan with the sauce, stirring to coat. Cook for an additional 2-3 minutes until everything is heated through.
Garnish and Serve: Sprinkle with chopped parsley before serving.