Chocolaty cookies with mini marshmallows. Yummy. These cookies actually seem to "age" well, and taste even better after a couple days... if they stick around long enough! Note: Do not refrigerate the dough or it will become too hard to handle. You may have to let it sit out longer than half an hour depending on the room temperature, otherwise the dough will not cooperate and will be too soft (because of the melted chocolate).