In a sauce pan combine cream, yolks and sugar and whisk it well until thoroughly combined.
Heat it on low flame and cook the mixture until it becomes thick and coats the back of the spoon. Do not let it boil. Keep flame low.
Remove from flame and add the chocolate chips.
Whisk until chocolate melts and combines together with the custard.
Pour it into four serving bowls or glasses and refrigerate for five hours or overnight.
Top it with sliced pistachios and choco chips and serve it cold.