2 1/4cupsunsalted butterroom temperature, cut into small pieces
Instructions
Add egg whites and sugar to a bowl.
Place the bowl over a pot of gently simmering water. Whisk the egg whites and sugar constantly until the sugar dissolves, about 5 to 10 minutes. Alternatively, you could use a candy thermometer and the mixture will be done when it reaches 160°F
Transfer the egg white mixture to the bowl of a stand mixer with a whisk attachment. Whisk on high speed for 10 minutes, or until the bowl of the mixer is no longer warm to the touch.
Once cooled, and while whisking, add the vanilla, almond extract, and salt.
Add the butter while whisking, one piece at a time, until all of the butter is incorporated.
Whisk on high for an additional 5 or so minutes until the buttercream is glossy and smooth.