Scrub the potatoes well under cold water, pat them dry with a paper towel.
Place the potatoes on a baking sheet, and pierce the potatoes all over with a fork.
Lightly coat the potatoes with olive oil.
Bake at 400°F for 60 to 75 minutes.
The potatoes will darken in color and some of the sugars may run out. Let the potatoes cool for 10 minutes.
In a medium-sized bowl beat butter with the brown sugar, cinnamon, vanilla, and salt for 2 minutes until light and fluffy.
Slice the potatoes, fluff with a fork, and add the whipped butter
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