1. In a saucepan pour the milk, add the sugar and butter and mix on medium heat until all is combined.
2. Remove the saucepan from the heat and add the dark chocolate. Mix with a spatula until the chocolate is melted and mix everything.
3. In a mixing bowl add the puffed rice and cocoa powder and mix. Pour the prepared chocolate and mix until is well combined.
4. Using 2 spoons, scoop the mixture onto the baking tray covered with parchment paper. Press the dough with a spoon to form a cookie round.
5. Let the cookies sit at room temperature for 30 minutes, then transfer them to the fridge to firm.
