Inspired by the famous British dessert, Sticky Toffee Pudding and another banana cake version of it that I developed, this dense moist cake is the perfect way to use those Fall pumpkins. This cake does not have a typical cake texture; like a good sticky toffee pudding, it sort of collapses in your mouth to a dense, rich, caramel-y, luscious bite that is simply addictive. Using brown butter in the frosting adds a beautiful caramel note to the cream cheese icing.