In the bowl of a stand mixer fitted with the paddle attachment, beat butter on medium speed until creamy, about 2 minutes.
Add confectioners' sugar, milk, and vanilla extract and beat on low speed until combined, about 1 minute. Increase speed to medium-high and beat until light and fluffy, about 4 minutes.
Spread or pipe frosting onto cooled cakes or cupcakes. Enjoy!
Interesting Facts
This recipe makes enough frosting to cover an 8-inch round or square cake or 24 cupcakes.
To make a chocolate version of this frosting, add 3 tablespoons of unsweetened cocoa powder to the frosting.
This frosting can be stored in an airtight container in the refrigerator for up to 5 days.