Reduce the speed to low and gradually add the powdered sugar. Once all of the powdered sugar is incorporated, increase the speed to medium-high and add the vanilla, mixing until incorporated. Whip at medium-high speed until light and fluffy, about 2 minutes, scraping the bowl as needed. Frost cupcakes as desired (cupcakes are pictured with the frosting piped using a Wilton 1M decorating tip
). The cupcakes can be stored at room temperature in an airtight container for up to 4 days.