A luscious and creamy chocolate frosting perfect for cakes and cupcakes.
In a saucepan, melt the butter over low heat.
Use low heat to prevent the butter from burning.
Stir in the cocoa powder until smooth.
Whisk continuously to avoid lumps.
Remove from heat and let cool slightly.
Cooling prevents the sour cream from curdling.
Blend in the sour cream, vanilla extract, and salt.
Mix until the ingredients are fully combined.
Gradually add the confectioners' sugar, stirring until smooth.
Add the sugar in batches to avoid clumps.
Spread the frosting on your cooled cake or cupcakes.
Ensure the cake is completely cool to prevent the frosting from melting.