Beat butter and 1/4 cup cocoa powder together in a bowl with an electric mixer on low until light and fluffy. Gradually add milk, remaining 1/4 cup cocoa powder, and vanilla extract; beat until smooth. Add confectioners’ sugar, about 2 tablespoons at a time, until desired consistency is reached.
For a more dark-chocolaty taste or to counteract the sometimes prevalent taste of confectioner’s sugar, add more cocoa powder.
Margarine can be substituted for butter if desired.
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