01 -
In a food processor, add 1 cup pistachios and pulse until the consistency resembles coarse sand.
02 -
In a large mixing bowl, use a hand mixer or stand mixer to beat the softened salted butter until light and fluffy, 2 to 3 minutes.
03 -
Mix in the vanilla extract until fully combined and smooth.
04 -
Add the processed pistachios to the bowl and give it a quick mix.
05 -
Add powdered sugar 1 cup at a time, mixing well between each addition until smooth.
06 -
Frost immediately or store covered in an airtight container.