Place  the peanuts in a food processor and chop them finely.

Then mix  the crushed peanuts with the crushed biscuits. 

Pour the sugar and cocoa into the saucepan, mix with a whisk and  cover with milk. 

We put it on the stove over moderate heat and  mix everything thoroughly with a whisk until smooth. 

Then add  the butter with the vanilla sugar  and mix again.

Pour  the prepared mixture over the peanut cookie mixture and mix.