Preheat the oven to 350 degrees.
In a large bowl combine the brownie mix, flour, eggs, melted butter, and espresso powder. Mix until the ingredients are just combined.
Fold in the chocolate chips.
Divide the dough into 9 pieces. Roll into balls and put on a baking sheet.
Bake for 10-11 minutes. Remove from oven and let cool for 5 minutes before removing to a wire rack.
Sprinkle with salt if desired.