- 1/3 cup butter, at room temperature
- 1/2 cup unsweetened cocoa powder, divided
- 1/3 cup milk
- 1 tablespoon vanilla extract
- 1 (16 ounce) package confectioners' sugar, sifted
- 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.