This is a classic, rich, and delicious chocolate ganache frosting. Yum.
Chop chocolates and transfer into a heat proof bowl.
Heat cream until bubbles form around the edge of the pan, pour cream over the chocolate. Let sit for 1 minute then stir until combined.
Add butter and vanilla and stir until combined.
Transfer to the bowl of an electric mixture and let cool for 10 minutes.
Sift powdered sugar into the mixture and beat until combined.
Continue to beat with an electric mixer until lighter in color and creamy.