Heat the oven to 350. Clean the potatoes and poke them with a fork. Brush with the Olive Oil and season with the Salt. Roast, uncovered, for 40 minutes or until soft. Allow to cool
Halve the potatoes and scoop out the flesh. Use a ricer or similar tool to make the flesh smooth
Heat the Butter and Whipping Creme in a sauce pan to a simmer. Fold that into the Potatoes. Add the Maple Syrup, Nutmeg and Salt. Cover and chill for at least 2 hours
Heat oven to 350 and bake covered for 1 Hour. Stir. Turn up the heat to 450. Sprinkle on the Marshmallows and bake uncovered for 15 more minutes.
Sprinkle with the toasted Pecans and serve immediately.