Prepare potato by washing and poking full (no spot left unpunctured) of holes with a fork (both top & Bottom) make sure holes penetrate trough to core of potato.
Rinse potato and let air dry until skin is dry.. coat whole potato with a film of olive oil then salt the outside skin.
Set potato on top oven rack (with pan below it on bottom rack to catch dripping starch) then let potato bake at 325 for 50 min.
Split top of potato with knife in a star pattern.
Let bake for another 20 minutes until fluffy and dry.
Let potato cool and break into 9-10 smaller pieces. put in dehydrator and let dehydrate over night until completely hard.
TO REHYDRATE: Soak pieces in a cup of hot water for 30 to 40 min or until tender again.