Chocolate Crackle Cookies

Direction :

Melt chocolate and cool:
Melt chocolate in a heatproof bowl set over a pan of simmering water, stirring. Set aside, and let cool.
Sift dry ingredients:
Sift together flour, cocoa powder, baking powder, and salt in a medium bowl; set aside.
Cream butter and brown sugar:
Mix 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 2 batches, alternating with the milk.
Divide dough and refrigerate:
Divide dough into 4 equal pieces. Wrap each in plastic; refrigerate until firm, about 2 hours.
Preheat oven and prep baking sheets:
Preheat oven to 350°F. Line baking sheets with parchment paper.
Form cookies:
Divide each piece into 16 (1-inch) balls. Roll in granulated sugar to coat, then in confectioners' sugar to coat. Space 2 inches apart on baking sheets.
Bake:
Bake until surfaces crack, about 14 minutes. Let cool on sheets on wire racks.