- 1/4 cup butter
- 2 1/2 cups confectioners' sugar
- 2 tablespoons milk, or more as needed
- 1 teaspoon vanilla extract
- Heat butter, stirring constantly, in a saucepan over medium-low heat until it browns and becomes very aromatic, 5 to 10 minutes. Whisk confectioners' sugar into butter until dissolved and remove saucepan from heat; stir in milk and vanilla extract.
- Beat butter mixture using an electric mixer until frosting is smooth; add more milk if frosting is too thick.