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Add the room temperature butter to a bowl or bowl of a stand mixer.
beat for about 5 minutes, until fully whipped.
Beat in the salt and powdered sugar two cups at a time while the mixer is running on low speed. Let run for about 5 minutes.
Beat in the milk and vanilla (I like clear vanilla for this) until completely creamy and well combined.
Pipe onto cupcakes or add to cakes. Store any extra in the fridge for up to 2 weeks.