Pour granulated sugar into a small bowl and set aside.
In a medium bowl, whisk together the flour, cocoa powder, baking soda, baking powder and salt, then set aside.
Melt butter in a small bowl (in the microwave).
In the bowl of an electric mixer, combine brown sugar and melted butter. Blend until well combined. Add eggs, one at a time and continue to blend. Add vanilla.
While mixing, slowly pour in bowl of dry ingredients and stir just until all ingredients are incorporated.
Using a 2 tablespoon cookie scoop, scoop dough into balls, then roll into the small bowl of granulated sugar. Press down the tops of the cookies a bit (with your hands, or the bottom of a glass). Sprinkle with additional sugar if desired.
Bake cookies on parchment paper lined (or Silpat lined) baking sheets (one baking sheet at a time) in a pre-heated 350°F oven.
Bake cookies for 12-14 minutes or until cracked and puffy. Remove cookies from oven, and allow to cool on baking sheet a few minutes before moving to a cooling rack.