In a large skillet, cook the butter over medium heat for 8-10 minutes, stirring constantly until it becomes a deep golden brown color.
Remove from heat and pour into a large bowl. Refrigerate fro 3-4 hours until solidified.
Using a mixer, beat the solidified butter until it is light and fluffy.
Add the milk and vanilla extract. Slowly beat in the powdered sugar until well combined.
Continue beating the frosting on high for 5 minutes to get a light and fluffy buttercream.
Use to decorate a cake or store refrigerated for up to 2 weeks.
Source:
thecreativebite.com