Preheat oven to 160C.  Line a large rectangle baking pan (approx 23x33cm) with baking paper.

Melt the chocolate & nuttelex together in a microwave dish on medium power for about 2 mins.  Stir to combine & set aside to cool.

Grind sugar in a thermo machine - speed 8, 8 secs.  (Can use normal sugar or castor sugar if no way to grind the sugar)

Add the egg & vanilla, beat together until light & pale. (thermo machine with butterfly tool, speed 4 for 2 mins).  Remove butterfly tool.

Add the flour & the melted chocolate/butter mixture, mix until combined (thermo machine speed 5, 20 secs).

Bake in the oven for 25 minutes.  A light crust will from on top once cooked.  Allow to cool in the pan.  Cut into pieces.