Best Buttermilk Frosting Recipe. Beat in egg and vanilla. Add additional heavy cream if a creamier frosting is desired.
Turn the mixer up to medium speed and mix for 1 minute until creamy. Beat in egg and vanilla. In a separate bowl whisk flour baking soda and salt.
Beat until smooth adding more buttermilk or confectioners sugar as needed.
Add additional heavy cream if a creamier frosting is desired. Apart onto greased baking sheets. Sift confectioners sugar and add it to the cocoa and buttermilk mixture along with vanilla. Cream butter and sugar until light and fluffy.