Melt the butter and combine it with the sweetened condensed milk & vanilla extract until well blended.
Add the graham crumbs, coconut and chocolate chips. Mix to combine well.
Refrigerate for an hour or so before rolling the mixture into 1 ¼ inch balls. You want to make these on the smallish side as they are quite rich.
Roll the balls in additional graham crumbs and once again chill until firm.
Refrigerate in a sealed container to store.
