Layer: Place the frozen meatballs and chopped potatoes into the bottom of your slow cooker.
Mix: In a small bowl, whisk together the two cans of cream soup and the dry onion soup mix. (Optional: add 1/2 cup of water or beef broth if you prefer a thinner gravy).
Pour: Pour the mixture over the meatballs and potatoes. Stir gently to make sure everything is coated.
Cook: Cover and cook on Low for 6–8 hours or on High for 3–4 hours.
Serve: Give it a good stir before serving. Garnish with fresh parsley if you want to be fancy!