Pour custard powder,sugar powdered milk, chocolate Powder into a bowl,add water to mix gradually till you get a thick,smooth and stable mixture

Now boil 1 cup of water,when it boils well,pour into custard mixture,stir after to OU add half of the boiled water,at this point,you will see that it has 2 colours,not fully done,so pour in remaining water, but not all water at once,stir well with a whisk or wooden spoon