01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the flour, cocoa powder, baking soda, and salt; set aside.
03 - In a large bowl, beat the butter, granulated sugar, and brown sugar until light and fluffy, about 2 minutes.
04 - Add eggs one at a time, beating well after each addition; then mix in vanilla extract and dissolved espresso until combined.
05 - Gradually add the dry mixture to the wet ingredients, stirring just until incorporated.
06 - Fold in the semisweet chocolate chips evenly.
07 - Drop tablespoon-sized portions of dough onto prepared baking sheets, spacing them about 2 inches apart.
08 - Bake for 9 to 11 minutes, until the edges are set but centers remain soft.
09 - Allow cookies to cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely.