Cocoa powdered milk bar (Polish dessert from the 80s)

The cocoa powdered milk block recipe was made in the PRL years when the acquisition of real chocolate in stores was bordering on a miracle. Dessert, which was supposed to be a substitute, quickly became a real hit. Although now we can easily stock up on various products, the glory years of this treat have not passed, it's still as delicious as ever.

Ingredients:

Butter - 250g
Powdered milk (fat) - 500g
Sugar - 2 cups - 500g
Cocoa powder - 3 spoons - 30g
Water (not pictured) - 1/2 glass - 125 ml
Butter biscuits - 100g
Plain wafers [not waffles :) ] - 100g
Raisins - 50g

I ballparked the quantity of the last three ingredients, you can add more or less, or use nuts or dried fruits instead. When i was young, i ate it like this, so that's how i decided to make it now :)