Melt the chocolate in the microwave in 30 second intervals, mixing in between. Reserve.
Put everything except the chocolate in a pot and mix using a whisk until it starts to boil and thickens.
Remove from the heat, add the melted chocolate and mix.
Pour onto the container on top of the cookie layer.
Let cool down to romo temperature and take to the fridge for at least a couple of hours for it to thicken up further.