Instead of rum, cognac or red semi-sweet wine can be added to the "potato" dough. If the dessert is intended for children, replace alcohol with grape or apple juice.
Heat the milk together with the sugar until it is completely dissolved. Grind cookies into small crumbs. Add warm milk with sugar and butter to a bowl with biscuit crumbs. To stir thoroughly.
Add 2 tbsp. l. cocoa and rum. Mix again.
To fashion from the resulting mass cakes in the form of potatoes. Mix the remaining cocoa with powdered sugar, roll each cake in the mixture and refrigerate for 30-40 minutes.
BTW: Instead of rum, cognac or red semi-sweet wine can be added to the "potato" dough. If the dessert is intended for children, replace alcohol with grape or apple juice.