Add the granulated sugar and brown sugar. Beat for 2-3 minutes until light and fluffy.
Beat in the egg and vanilla extract for 1-2 minutes.
In a separate bowl, combine the all-purpose flour, cocoa powder, baking soda, and salt. Stir into the batter until combined, scraping down the sides of the bowl as needed.
Stir in the melted semi-sweet chocolate.
Mix in the semi-sweet chocolate chips.
Scoop 9 balls of cookie dough with a #40 dough scoop (about 2 tablespoons) onto a parchment-covered cookie sheet with at least two inches of space between balls of dough.
Bake at 350˚F for 8-10 minutes.
Repeat with remaining dough, allowing cookie sheets to cool between batches.
Allow the cookies to cool. Drizzle with melted semi-sweet chocolate chips or dust with powdered sugar.
Video
Notes
Store cooled cookies in an airtight container at room temperature for 3-4 days or in the freezer for up to four weeks.