Preheat your oven at 180c and line your baking sheet with parchment paper.
In a large bowl, add the butter and brown sugar, and beat for 2-3 minutes, until light and fluffy. Add the eggs and mix well.
Add vanilla extract, baking soda and mix until it's all combined.
Fold in the cocoa powder and flour, and lastly the chocolate chips, just until it's all incorporated. Be careful to not overmix!
Scoop out cookie balls, flatten each ball & place a square in the center. Fold and roll it to shape again into a ball, and place in your prepared baking tray. (Do this step until you run out of cookie dough)
Bake these for 10-12 minutes, or until the edges look set and the center slightly soft.
Allow the cookies to cool down for 10 minutes before enjoying! ✨