Place chopped chocolate in a microwave-safe container. Microwave in 30-second increments, stirring in between each interval, until the chocolate is completely melted.
Add yoghurt to a medium bowl and pour the melted chocolate over the yoghurt. Whisk for a full minute.
Divide the mixture between 2 small jars or bowls. Cover with plastic wrap and refrigerate for at least 2 hours to thicken before serving.