- 2 1/2 cups (about 15 ounces) semisweet chocolate chips
- 1 1/2 cups (3 sticks) unsalted butter, softened
- 1/3 cup confectioners' sugar
- 1 pinch of salt
Melt chocolate in a heatproof bowl set over a pan of simmering water, stirring occasionally. Let cool to room temperature, 25 to 30 minutes.
Meanwhile, put butter, confectioners' sugar, and salt into the bowl of an electric mixer fitted with the paddle attachment; mix on medium-high speed until pale and fluffy, 3 to 4 minutes. Reduce speed to low. Add melted chocolate, and mix until combined, scraping down sides of bowl as needed. Use immediately.