Biscoff Shortbread Bars are the best! Biscoff cookies are crispy gingerbread-ish butter cookie. Trader Joe's makes a wonderful Biscoff-like spread called Speculoos Cookie Butter. Speculoos is the generic term for this cookie . Any Biscoff-type spread will do. The simplicity of the shortbread paired with the rich spices of the Speculoos Cookie Butter make these dessert bar sperfect for family gatherings and lunchboxes!  They are very easy, and require only a few ingredients.