Combine potatoes and cold water to cover in large saucepan. Partially cover. Bring to boiling; cook 30 minutes, until tender. Drain.
Grate eggs into large bowl; mash with fork, pressing against side of bowl. Stir in mayonnaise, mustard, sugar, salt and pepper.
Peel potatoes; cut into chunks. Add to dressing in bowl. Add pickle, onion and parsley, tossing to coat and mashing potatoes with fork to desired consistency. Refrigerate, covered, for several hours.
Garnish with paprika, egg slices and parsley sprigs if desired. Makes 8 servings.