Gradually add the cooled mixture a little at a time, adding the vanilla in the process. Continue to whip the frosting until light and airy, but not quite like whipped cream.
Allow the icing to return to room temperature before using; you may want to lightly whip the icing again to loosen the texture slightly. You can freeze iced cakes, too: first freeze the cake ...
"Mixing in cream cheese, whipped cream, lemon zest, or even Nutella can make such a difference." From making frosting creamier or fluffier to changing its flavor, these easy changes will certainly ...