01 - Preheat oven to 350°F. Line 2 baking sheets with parchment paper.
02 - Whisk together flour, cocoa powder, baking soda, and salt in a medium bowl. Set aside.
03 - Stir instant espresso powder and hot water in a small bowl until completely dissolved.
04 - Beat butter, granulated sugar, and brown sugar in a large bowl until light and fluffy, approximately 2 minutes.
05 - Beat in eggs one at a time. Add vanilla extract and espresso mixture, mixing until fully incorporated.
06 - Gradually add dry ingredients to wet mixture, mixing until just combined. Do not overmix.
07 - Gently fold chocolate chips into the dough until evenly distributed.
08 - Drop tablespoon-sized scoops of dough onto prepared baking sheets, spacing about 2 inches apart.
09 - Bake 9 to 10 minutes, until cookies are set at the edges but remain soft in the center.
10 - Let cookies cool on baking sheets for 5 minutes, then transfer to wire racks to cool completely.