Preheat the oven to 350F then line a baking sheet with parchment paper then set aisde.
Cream the butter, brown sugar, and granulated sugar together until creamy.
Mix in the egg, and vanilla extract until combined, then add in the flour, baking soda, cocoa powder, and salt and mix just until combined. Add in the ⅔ cup of chocolate chip and gently fold.
Scoop out 12 equally sized cookie dough balls, place them on a baking sheet and top each cookie with more chocolate chips. and gently flatten to about 1 inch in thickness.
Bake the cookies in the preheated oven for 10 minutes then let cool on the baking sheet for another 10 minutes then transfer to a cooling rack.
