In medium bowl, whisk together flour, cocoa, baking soda, and salt.
In a large bowl, cream together the butter and sugars until light and fluffy. Add eggs one at a time. Add vanilla and mix until well combined.
Add flour mixture and mix on low speed just until combine. Stir in chocolate chips.
Using a small cookie scoop, drop by rounded spoonfuls on to cookie sheets. Bake for 8 to 10 minutes, until lightly browned on the edges and still be soft in center.
Allow cookies to cool on baking sheet for 5 minutes before removing to a wire rack to cool completely.