In a large bowl, mix the ground beef and pork. Don't be afraid to get your hands dirty - it's the best way to mix!
Add the breadcrumbs, milk, and eggs. Mix gently. Remember, we're not kneading bread here - overworking the meat can make tough meatballs.
Toss in the chopped onion, garlic, nutmeg, allspice, cardamom, salt, and pepper. Mix again, but keep it gentle.
Now for the fun part - roll the mixture into meatballs about 1-2 inches in diameter. I like using an ice cream scoop for consistency, but eyeballing it also works!
Whisk together the cream of mushroom soup, beef broth, onion soup mix, and steak sauce in your slow cooker.
Carefully add the meatballs to the slow cooker, ensuring they're coated with the sauce.
Cover and cook on low for 6-8 hours. Your house is going to smell amazing!
About 30 minutes before serving, cook your egg noodles according to the package instructions.
Just before serving, stir the sour cream into the slow cooker. It gives the sauce that creamy, dreamy texture we all love.
Taste and adjust seasoning with salt and pepper if needed.