Brown the butter in a medium sauce pan by melting it over medium-high heat and then letting it continue to cook until brown bits form. Swirl the pan around but let it get toasty brown.
Pour the butter into a heat-proof bowl and whisk. Add in the powdered sugar and vanilla and mix until smooth and creamy.
Add a little milk or cream if desired for more of a glaze.
Notes
For thicker more traditional buttercream, let the browned butter solidify before creaming it with the powdered sugar and adding a little milk as needed. Adding more liquid will create more of a glaze.
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