Instructions
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Step1
In a medium bowl, mix powdered sugar and softened butter with a spoon or electric mixer on low speed. Depending on the power of your electric mixer, it may take 1 to 2 minutes for the butter to blend with the powdered sugar into a stiff mixture.
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Step2
Add vanilla and 1 tablespoon of milk. Using an electric mixer on low speed, mix for 30 to 60 seconds, or stir by hand with a spoon, until fully incorporated. The frosting should have a slightly smoother consistency but will remain thick. Scrape down the bowl occasionally as you mix.
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Step3
Gradually beat in the remaining tablespoon milk, adding about 1/2 teaspoon at a time until frosting is smooth and spreadable.
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Step4
If the frosting is too thick, beat in more milk, just a few drops at a time, until it is smooth and easy to spread. If the frosting is too thin, gradually beat in a small amount of powdered sugar—about 1 tablespoon at a time—until it thickens and holds its shape. After adding any additional ingredients, mix the frosting for about 1 minute to ensure everything is fully incorporated.
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Step5
Makes about 1 3/4 cups of frosting which is enough to generously frost a 13x9-inch cake or to frost an 8- or 9-inch two-layer cake.