Preheat the oven to 350°F (175°C).

In a large mixing bowl, beat the softened butter with granulated and brown sugar until light and fluffy.

Mix in the eggs one at a time, followed by the vanilla extract.

In another bowl, whisk together the flour, cocoa powder, baking soda, and salt.

Gradually add the dry mixture to the wet mixture, stirring until just combined.

Gently fold in the chocolate chips using a rubber spatula.

Using a cookie scoop or tablespoon, drop rounded scoops of dough onto a parchment-lined baking sheet.

Bake for 10-12 minutes, until the edges are set but the centers are still slightly soft.