In a large bowl, combine the ground digestive biscuits, cocoa powder, and powdered sugar.
Gradually add the milk, butter, and vanilla extract. Knead until you have a smooth, pliable dough.
On a sheet of parchment paper, roll out the dough into a rectangle approximately 5 mm thick.
Spread the filling (Nutella, mascarpone, or any other cream you prefer) evenly over the rolled-out dough.
Carefully roll up the dough tightly, like a Swiss roll, using the parchment paper to assist.
Wrap the roll in plastic wrap and refrigerate for at least 2 hours to firm up.
Before serving, slice the roll and sprinkle with powdered sugar or decorate with chocolate, if desired.
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