
Rich, chocolaty and delicious, these are a perfect cookie for Christmas, or any time of year!
In a medium saucepan (or in a microwave safe bowl, using 50% power), melt the butter and chocolate, stirring frequently. Once melted, set aside to cool slightly.
Prepare cookie icing by combining all ingredients in a medium bowl and mixing together with a whisk. Place wire cooling rack (with cookies on it) over a baking sheet (to catch any excess icing). Spoon a small amount of icing onto the top of each marshmallow, and use the back of the spoon to spread it a bit. After icing just a couple cookies, top with sprinkles before the icing dries.