To prepare the cookie dough, melt the chocolate in a bowl over a saucepan of barely simmering water (bain-marie) until the temperature reaches 104°F (40°C), or in the microwave. Sift the flour, cornstarch, and cocoa powder into a bowl.
Beat together the butter, confectioners’ sugar, and salt in the stand mixer on low speed. Beat in the dry ingredi
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