01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together flour, cocoa powder, baking soda, and salt in a medium bowl.
03 - Beat softened butter, brown sugar, and granulated sugar until light and fluffy.
04 - Beat in eggs one at a time. Stir in vanilla extract and dissolved espresso.
05 - Gradually add dry ingredients to wet mixture, mixing just until combined.
06 - Fold in chocolate chips and chopped dark chocolate.
07 - Scoop tablespoon-sized dough balls onto prepared sheets, spacing 2 inches apart.
08 - Bake 10-12 minutes until edges are set but centers remain soft.
09 - Cool on baking sheets 5 minutes, then transfer to wire rack to cool completely.