In a large bowl mix the butter and brown sugar until well combined. In the bowl of a standing mixer combine melted butter sugar egg banana peanut butter and vanilla. From Magnolia Table Volume 2.
Preheat the oven to 350ºF 180ºC.
In a large bowl cream the butter. First make the cookies. Sift in the flour baking soda salt and cinnamon. In a large bowl mix the marshmallow fluff.
