Preheat oven to 350 degrees F. Prepare 2 baking sheets by greasing or lining with parchment paper. Set aside.

Using a hand mixer or stand mixer combine the butter and sugar. Add the egg and combine, then add the vanilla and combine. Scrape down the sides of the bowl.

Sift the flour, baking soda, and cocoa powder into the wet mixture, combine using a low speed until the mixture forms a dough. Add the cup of chocolate chip to the mixture and fold to combine.

Using a cookie scoop or a TBS make balls of dough, then place an inch apart on the baking sheet. Press the tops down slightly to flatten. Add a few chocolate chips to the top of the dough balls and slightly press them into the dough.

Place the baking sheets into the oven and cook for 9-11 minutes, checking at 9 minutes. Do not over-bake the cookies. Remove from the oven and let sit for 5 minutes. Transfer the cookies to a wire rack and let cool.

Store in a ziplock bag or sealed container to keep fresh for up to 1 week.