Preheat oven to 350º F. Line two large sheet pans with parchment paper.
In a medium bowl, whisk together the flour, cocoa powder, baking soda and salt then set aside.
Place butter and sugar in a large bowl (or bowl of your stand mixer) and cream together until light and fluffy.
Add eggs, vanilla and milk and mix. NOTE: the mixture will not come together until the dry ingredients are added.
Gradually add the dry ingredients and mix until combined.
Use a 1-inch scoop to drop the batter onto the prepared sheet pans, 2-inches apart.
Bake for 10 - 12 minutes, until a toothpick inserted comes out clean.
Move to a cooling rack and allow to cool completely