Ingredients

  • 8 ounces bittersweet chocolate, finely chopped
  • 1 1/4 cups all-purpose flour
  • 1/2 cup unsweetened Dutch-process cocoa powder
  • 2 teaspoons baking powder
  • 1/4 teaspoon coarse salt
  • 1/2 cup (1 stick) unsalted butter, room temperature
  • 1 1/2 cups packed light brown sugar
  • 2 large eggs
  • 1 teaspoon pure vanilla extract
  • 1/3 cup whole milk
  • 1 cup granulated sugar
  • 1 cup confectioners sugar

Method

  • Melt chocolate in a heatproof bowl set over a pan of simmering water, stirring.
  • Set aside and let cool.
  • Sift together flour, cocoa powder, baking powder, and salt in a bowl.
  • With an electric mixer, beat butter and brown sugar on medium speed until pale and fluffy, 2 to 3 minutes.
  • Mix in eggs and vanilla, and then the melted chocolate.
  • Reduce speed to low; mix in flour mixture in two batches, alternating with the milk.
  • Divide dough into four equal pieces.
  • Wrap each in plastic; refrigerate until firm, about 2 hours.
  • Preheat oven to 350F.
  • Divide each piece into sixteen 1-inch balls.
  • Roll in granulated sugar to coat, then in confectioners sugar to coat.
  • Space 2 inches apart on baking sheets lined with parchment paper.
  • Bake until surfaces crack, about 14 minutes, rotating sheets halfway through.
  • Let cool on sheets on wire racks.
  • Cookies can be stored between layers of parchment in airtight containers at room temperature up to 3 days.