01 - Preheat oven to 350°F and line a baking sheet with parchment paper.
02 - Whisk together flour, cocoa powder, baking soda, and salt in a medium bowl.
03 - Using an electric mixer or whisk, cream the butter with granulated and brown sugars until light and fluffy.
04 - Beat in the egg and vanilla extract until fully combined.
05 - Gradually mix dry ingredients into the wet mixture until just incorporated.
06 - Gently fold semisweet chocolate chips into the dough.
07 - Drop small clumps of dough about 2 inches apart onto the prepared baking sheet.
08 - Bake for 18 to 20 minutes until set and edges are slightly crisp.
09 - Cool completely, then break into crumbles and serve alone or as a topping for ice cream.