Pre heat oven 350. Boil a large pot of salted water. Peel skin off and wash yams. Cut and cube . Add cubed yams to boiling water. Cook until soft . About 10 minutes. Taste test every so often to feel texture.

Drain and return to pot. Add butter, heavy cream, brown sugar, cinnamon, and nutmeg. Mash and blend together .

Grease a baking dish and pour yams into dish. Top with mini marshmallows. Place in oven and bake 15 to 20 minutes. Remove and let sit for at least 5 minutes. Enjoy