Boil sweet potatoes for 20-30 minutes until soft. Preheat oven to 350 while boiling.
Drain cooked potatoes thoroughly. Add coconut milk, maple syrup, butter, cinnamon, and salt.
Whip until very smooth and blended with a hand or stand mixer. Spread mixture into a buttered casserole dish.
Top with pecans and marshmallows. Bake 20-25 minutes until potatoes are bubbly and marshmallows are browned.