Classic Chocolate Buttercream

• 4 ounces semisweet chocolate, finely chopped, or ⅔ cup semisweet chocolate chips
• 12

Put the chocolate in a heatproof bowl, set it over a saucepan of simmering water (do not let the bottom of the bowl touch the water), and stir occasionally until the chocolate is completely melted. Set the chocolate aside to cool until tepid.

In the bowl of a stand mixer fitted with the paddle attachment (or in a medium mixing bowl, using a handheld mixer), beat the butter on medium spe