I bought a jar of Speculoos ages ago from a trip to Europe and it's been sat at the back of my cupboard gathering dust. You can now buy it in supermarkets here which is good as I will probably want more after the success of these cupcakes. I baked these for work using a recipe I found online and they were absolutely delicious. It has a rich caramel flavour and a lovely smooth consistency. It tastes exactly like the little Lotus biscuits that you often get with coffee/tea but in cupcake form.
Recipe available here