Preheat your oven to 350°F (175°C).
Cream together the unsalted butter, dark brown sugar, and granulated sugar until light and fluffy.
Beat in the egg, vanilla extract, and molasses until fully combined.
Whisk together the all-purpose flour, cocoa powder, baking soda, and salt until well blended. Gradually add this mixture to your wet ingredients, stirring just until combined.
Gently fold in the chocolate chips until evenly distributed throughout the dough.
Use a cookie scoop or tablespoon to portion out dough balls, rolling them in granulated sugar before placing them on a prepared baking sheet. Bake for about 10 minutes or until edges are set but centers remain soft.