Beat the butter and salt in a large bowl with a mixer on medium-high speed until smooth and fluffy, about 2 minutes.
Reduce the speed to low and beat in the confectioners' sugar 1 cup at a time, increasing the speed to medium high. Repeat with the remaining 4 cups. Beat until fluffy, about 3 minutes. Beat in the milk and vanilla until smooth.
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Photograph by Ryan Dausch
Tools You May Need
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