Melt the butter and mix in cocoa powder with that and stir smoothly to a fine paste-like form, ensuring there are no lumps remaining in the paste.
Transfer the paste in a microwave safe container and heat it up for about 2 minutes.
Take out and slowly add the milk and sugar, stirring very well so the sugar gets completely dissolved in the mixture, and there are no lumps remaining. Depending on the consistency of the milk you are using, you might add less milk also, but the choco paste must not be runny.
Transfer the paste into chocolate moulds and keep in the freezer for about 90 minutes. Take out, scoop the chocolates and enjoy !!