01 -
In the bowl of a stand mixer fitted with a whisk attachment, beat the unsalted butter on medium-high speed until pale and fluffy, about 3 minutes.
02 -
Add pure vanilla extract to the whipped butter and mix briefly to combine.
03 -
With the mixer on low speed, gradually add the sifted confectioners' sugar, whole milk, and a pinch of kosher salt, scraping the sides and bottom of the bowl frequently to ensure even mixing.
04 -
Increase mixer speed to medium-high and whisk until the frosting is light and aerated, at least 3 minutes and up to 7 minutes for optimal fluffiness.
05 -
If the buttercream is too thick to spread, gradually beat in additional whole milk, one tablespoon at a time, to reach desired smoothness.