Mix heavy cream and flour in a small bowl. Heat the mixure in the microwave for 45 seconds on high. Set aside to cool.

In a mixing bowl, combine butter, shortening, confectioner's sugar, vanilla extract and butter extract.

Using and electric mixer, beat on low until combined. Then beat on medium speed for 6-8 minutes.

Next add the heavy cream mixture, and beat on medium speed for another 10 minutes. ( Mixture will appear soupy at first, but will become fluffy.)