In a large bowl or stand mixer, measure out the butter, vanilla extract, and powdered sugar. Start to stir to combine.

With the mixer on, stream in one tablespoon of milk at a time until the frosting starts to come together and it looks creamy.

Scrape the sides of the bowl and mix again, if it still hasn't come together by now, continue to add milk, one tablespoon at a time, until the desired consistency is reached. The frosting should be thick enough to hold its shape but light enough that you can move a rubber spatula through it with ease.

Use as desired!