Step 1

Cream butter and shortening together on medium speed until light and fluffy. This should take about 1 minute.

Step 2

Add the vanilla, scraping down the sides of the bowl as needed.

Step 3

Gradually add the confectioners’ sugar, 1 cup at a time, then beat well. Scrape down the sides of the bowl as needed.

Step 4

Once all the sugar is mixed in, gradually add in the milk (or heavy cream or water), a little at a time, until the desired consistency is reached.