01 - Preheat oven to 375°F. Line two baking sheets with parchment paper.
02 - In a large mixing bowl, whisk together flour, cocoa powder, baking soda, baking powder, and salt until evenly distributed.
03 - In a separate bowl, whisk melted butter, granulated sugar, and brown sugar until smooth. Add eggs and vanilla extract, whisking until fully incorporated.
04 - Alternately add dry mixture and milk to wet mixture, beginning and ending with dry ingredients. Gently fold together until just combined, avoiding overmixing.
05 - Fold chocolate chips into batter using a spatula or wooden spoon.
06 - Using a large cookie scoop or 1/4 cup measure, drop batter mounds onto prepared baking sheets, spacing approximately 2 inches apart. Gently shape into rounds and top with additional chocolate chips if desired.
07 - Bake for 10 to 12 minutes until tops are set with slight cracking but retain soft centers.
08 - Cool on baking sheet for 5 minutes, then transfer to wire rack for complete cooling.