01 - Preheat oven to 350°F. Line 2 baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, cocoa powder, baking soda, and salt. Set aside.
03 - In a small bowl, stir together instant espresso powder and hot water until dissolved.
04 - In a large bowl, beat butter, granulated sugar, and brown sugar together until light and fluffy (about 2 minutes).
05 - Beat in eggs one at a time, then add vanilla extract and espresso mixture, mixing until combined.
06 - Gradually add dry ingredients to wet mixture, mixing until just combined.
07 - Fold in chocolate chips until evenly distributed.
08 - Drop tablespoon-sized scoops of dough onto prepared baking sheets, spacing about 2 inches apart.
09 - Bake 9–10 minutes, or until cookies are just set at the edges but soft in the center.
10 - Allow to cool on baking sheets for 5 minutes, then transfer to wire racks to cool completely.