Preheat your oven to 400 degrees F. Scrub the potatoes under cold water and pat them dry.

Place the potatoes on a baking sheet and pierce them all over with a fork. Brush the outsides with olive oil.

Bake for 1 hour to 1 hour and 15 minutes until done. Remove and let cool for 10 minutes.

In a medium mixing bowl, beat the butter, brown sugar, cinnamon, vanilla, and salt with a hand mixer for 2 minutes until smooth and fluffy.

Slice the potatoes down the center, fluff the insides with a fork, and top with some of the whipped cinnamon butter. Serve warm.