Given the task definition and input, reply with output. Given the background description of some cooking related query, summarize the question into a title

Some recipes call for stiff mashed potatoes, e.g. to help well formed shapes as in this recipe:http://www.tasteofhome.com/recipes/crunch-swiss-and-ham-appetizersShould I just boil the potatoes, mash way too much, and add no butter nor milk?
How to make stiff mashed potatoes?