step 1
In a pan melt butter, sugar, syrup and cocoa over low heat and stir.
step 2
Take pan off heat, add chocolate chips, crush biscuits and add them too and mix.
step 3
Line Swiss roll tin with backing paper and press mixture in.
step 4
Melt chocolate in a bowl over boiling water and pour over the mixture in the tin, then add any sprinkles or chocolate items on top.
step 5
put into the fridge for 1 hour then cut into 20 pieces.