Place chocolate chips in a large bowl or in the bowl of a stand mixer. Pour the cream into a saucepan and bring to a boil. As soon as the cream boils up to the top of the saucepan, quickly remove it from the heat and pour it over the chips. Let stand for a minute or two then stir with a whisk or use the paddle attachment for the mixer, to mix until smooth. Be sure to scrape the bottom of the bowl occasionally. Stir in the vanilla until well blended. Place a piece of cling wrap directly on the surface and allow to cool at room temperature or in the refrigerator.