01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, cocoa powder, baking soda, and salt. Set aside.
03 - In a large bowl, cream together butter, granulated sugar, and brown sugar until light and fluffy.
04 - Beat in eggs one at a time, then mix in espresso powder and vanilla extract until well combined.
05 - Gradually add dry ingredients to wet ingredients, mixing just until combined.
06 - Fold in 1 3/4 cups semisweet chocolate chips until evenly distributed.
07 - Scoop heaping tablespoons of dough onto prepared baking sheets, spacing about 2 inches apart.
08 - Press a few mini chocolate chips on top of each cookie, if desired.
09 - Bake for 10 to 12 minutes or until edges are set but centers are still soft.
10 - Allow cookies to cool on baking sheet for 5 minutes, then transfer to a wire rack to cool completely.