Speculoos is a kind of crunchy cookie or a flat biscuit popular in Belgium, France, and the Netherlands. Its shape is usually rectangular with a decorative image imprinted on the cookie’s face, although modern versions of the cookie can be in varied shapes.f you love the taste of speculoos cookies, you will love the taste of speculoos spread. You can find this at some of the specialty grocery stores or a European import store. This is a spread that has the same spicy, gingery taste of the cookies, but it is creamy and comes in a jar.