In the base of a kitchen aid or large bowl with a hand mixer, add softened butter and cream cheese
On medium high speed, beat the cream cheese and butter until fluffy (around 2 minutes)
Add salt, almond extract, and vanilla. Whip until combined
On low speed, add the powder sugar ½ cup at a time
Once all the sugar has been added, turn up the mixture and whip on medium high until light and fluffy (around 2 minutes)
Assembly: spread the icing onto the cooled cake