Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a large mixing bowl, cream the room temperature butter, brown sugar, and granulated sugar for about 3-4 minutes until light and fluffy.

Add the egg and vanilla extract to the creamed mixture, and mix on medium speed for 1-2 minutes.

In another bowl, whisk together the all-purpose flour, Dutch processed cocoa powder, baking soda, and salt. Gradually mix this into the wet ingredients.

Gently fold in the chocolate chips into the cookie dough.

Scoop the cookie dough into 8 equal portions, roll into balls, and flatten slightly on the baking sheet.

Bake for about 10 minutes until the edges are set but the centers remain soft.

Allow the cookies to cool on the baking sheet for 10 minutes before transferring to a cooling rack.