In a microwave safe bowl, heat the chocolate chips and the cream for about one minute. Stir until mixture is smooth. Allow to cool slightly.
In the bowl of a stand mixer fitted with the paddle attachment, beat the butter for about 2 minutes on medium-high speed.
With the mixer on low speed, add the ganache. Scrape down the sides and bottom of the bowl and then mix on medium-high speed for about a minute, until the mixture is smooth.
Gradually add the powdered sugar, one cup at a time, followed by the vanilla and salt.
Right before the final coat of buttercream, mix the buttercream with a spatula to push out any air pockets.
