This indulgent, velvety, smooth buttercream frosting for cookies is ideal for both spreading and piping and has a luxurious taste and texture, suitable for bakers of all levels. Makes about 3.5 to 4 cups of frosting.
Using a hand or stand mixer, beat the butter at medium speed in a large mixing bowl for about 30 seconds.
Add the powdered sugar to the mixing bowl in batches to avoid a mess. Mix the butter and sugar until they are well combined and have a smooth, creamy texture.
Sprinkle in the meringue powder into the bowl and continue to mix until it is fully incorporated. Meringue powder will help stabilize the buttercream.
Add vanilla extract to the mixture. Mix well to distribute the vanilla flavor evenly.
With the mixer running at low speed, gradually add the milk, one tablespoon at a time. Adding it slowly ensures you reach your desired consistency without making the buttercream too thin. You can adjust the amount of milk based on your preference for thickness.
Once all the ingredients are thoroughly combined, increase the mixer speed to medium-high and beat the buttercream for an additional 2-3 minutes. This will make the buttercream light and fluffy.
Notes
This should frost about 30 cookies with a thick layer (two tablespoons) or 60 cookies with a thin layer (one tablespoon). Nutrition is shown per tablespoon of frosting.