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

In a medium bowl, whisk together the flour, cocoa powder, baking soda, and salt. Set aside.

In a separate large bowl, cream together the softened butter, granulated sugar, and brown sugar until the mixture is light and fluffy.

Beat in the egg and vanilla extract until well combined.

Gradually add the dry ingredients to the wet mixture, mixing until just combined. Be careful not to overmix.

Fold in the chocolate chips gently.

Drop spoonfuls of dough onto the prepared baking sheet, spacing them about 2 inches apart.

Bake in the preheated oven for 10-12 minutes, or until the edges are set.

Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.