*No salt/pepper or any other flavoring added. These should be plain potatoes that have been peeled, cubed, boiled, and then mashed.
Allow potatoes to cool completely
before adding sugar. Otherwise they will melt the sugar and you will end up with a very runny mess that will not conform to an egg shape. I recommend allowing them to cool at room temperature rather than the fridge, as sometimes the condensation from the fridge can also make the mixture runny.
If needed, it is OK to add more sugar. The consistency will not be completely stiff and easy to roll into eggs before going into the refrigerator for an hour, but should be able to hold its shape.
Another variation of this candy can be made by rolling the filling into cigar shapes and rolling in 2 Tablespoons of cinnamon for Cinnamon Cigar Candy.