Step 1

Place the butter in the bowl of a stand mixer fitted with a paddle attachment and beat on medium speed until smooth, about 1 minute.

Step 2

Reduce the speed to low, slowly add confectioners, and beat until fully incorporated and smooth, about 3 minutes. Stop the mixer and scrape down the paddle and sides of the bowl with a rubber spatula.

Step 3

Add vanilla and salt. Mixing completely.

Step 4

Add milk one tablespoon at a time until it's a smooth consistency. Turn mixer to high and beat until light and fluffy.