Preheat oven to 350 degrees F. In a large bowl add the brownie mix, flour and instant coffee if you're adding that. Whisk until combined.
Add eggs and vegetable oil and mix. The batter will be very thick. Fold in the chocolate chips.
Scoop up 1-2 Tbsp of mix and roll into a ball with your palms. Put the powdered sugar into a bowl and roll your ball into it.
Place on a baking sheet that has been sprayed with non stick cooking spray or lined with parchment paper.
Make sure they are 1" apart so they can spread a bit.
Bake for 11-13 minutes or until the tops are cracked and edges are firming up and middle no longer looks raw. (11 will give you a very moist chewy texture, 13 will be closer to a brownie edge piece)
Remove and set on a cooling rack, keep on baking sheet until cooled for best results.