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I would like to make a chocolate material similar to the one seen in the picture.
The problem is the slight transparency (you can see the nuts shine through on the surface), which I just can't acchieve.
Could somebody help me or tell me which node I have to include?
Thank you
To achieve the transparency you need to combine volumetric scatter into the material - in place of the usual 'diffuse' shader.
The key to the transparency is to model the "chocolate" to that it has very thin layers over the "nuts".
I started by modelling the nuts :
Then added the chocolate (just a cube, rescaled), subdivided and used Sculpt mode to build up the chocolate around the nuts.
The material to include surface properties (the bumpiness and glossiness) along with the translucency is as follows :
Adjust the Density (the Value node) to vary the opaqueness of the chocolate. This is essentially just the same as a volumetric shader that you would use for a liquid - just with a higher density to make it appear more solid.
For best results, take care over the sculpting of the chocolate over the embedded nuts - you need consistently thin layers to get smooth transitions.
Blend file included 
I tried a similar approach, using a volumetric.
I made the nuts first as an array (they could be distributed around another mesh for shape). The nuts get a yellow material that should affect the subsurface light.
Then I shrink wrapped a plane with solidify modifier for depth.
I added a volumetric with a chocolate gloss as well as a clear coat. I am only using scatter as its quicker to render than absorption.
More nuts:
