01 -
Turn on your oven to 375°F and grease a 9x13 pan.
02 -
Let the cubed sweet potatoes cook in boiling water for about 15 minutes until soft.
03 -
Pour out the water so only the cooked potatoes are left.
04 -
Mix the potatoes with butter, cinnamon, vanilla, brown sugar, salt, and pepper, and mash everything together.
05 -
Stir in half of the pecans into the mashed mixture.
06 -
Put the mashed potatoes in the greased dish, smoothing it out evenly.
07 -
Sprinkle the leftover pecans and marshmallows evenly on top.
08 -
Pop it in the oven for 25 minutes or until the marshmallows are golden and toasty.