Place the cubed sweet potatoes into the Cooking Vessel and pour in enough water to cover the potatoes.
Select MANUAL/MODE at 400F and set the time to 30 minutes.
Bring to a boil.
Using the handle grips remove the pot from the heat, drain the excess water and place it on the countertop protector.
Add the sugar, salt, vanilla extract, and butter. Using a masher potato max the mixture until smooth.
Using a spatula spread the mashed potato making sure you have an even layer, top with a layer of pecan and on top a layer of mini marshmallows.
Preheat oven to 375°F.
When the preheating time is done, place the cooking vessel into the oven and bake it uncovered for 30-35 minutes or until the marshmallows are golden brown.
Remove the cooking vessel using the handle grips and place it on the countertop protector.