Preheat the oven to 350°F. Prepare a greased 9×13 baking dish. Press a piece of parchment paper (large enough so it overhangs the dish) into the baking dish.
In a mixing bowl, whisk together the dry ingredients: flour, cocoa powder, salt, and espresso powder. Set aside.
In another mixing bowl, whisk the eggs until smooth. Aggressively whisk in the sugar until incorporated. Next, add the melted butter, espresso, and vanilla extract. Mix until incorporated.
Whisk the wet ingredients into the dry ingredients. Lastly, fold in the chocolate chips.
Pour the brownie batter into the prepared baking dish. Bake for 30-35 minutes until set and cooked through. Let cool for 30 minutes. Gently use the parchment paper to lift the brownies out of the dish. Cut the brownies into 12 squares, and enjoy!