Here is another recipe using the divine spreadable biscuit. Please excuse my language, but holy crap these things taste amazing! The recipe here is very simple - shortbread base, a can of dulce de leche mixed with a jar of Speculoos spread and then a layer of your choice of chocolate.
I made half with milk chocolate and the other half with dark chocolate. In my opinion, the dark is by far the best. I have given out samples of these delicous chunks and had great feedback. If you have a jar of Speculoos lying around, I could not recommend a better way to use it! The dulce de leche marries so well with it. The Speculoos taste gives the treat a massive boost.