Chef Whitney was inspired by her love for all things Thanksgiving for this cookie. Every table at Thanksgiving has sweetpotato casserole. Her favorite version is the one topped with marshmallows. She decided to make a cookie version of this Thanksgiving classic. She begins by making her own sweetpotato casserole. The casserole is added into the dough with additional spices. She tosses the dough in cinnamon and sugar and of course tops it with a marshmallow. This is the dessert people will line up for at your Thanksgiving dessert table.