Preheat the oven to 350 degrees.
Make the brownie batter per package instructions, then add ⅓ cup of all-purpose flour. Mix until combined.
Use a small cookie scoop (or spoon) to scoop the batter onontoto a cookie sheet lined with parchment paper.
Bake for 18-20 minutes or until the tops of the cookies begin to crack.
Remove them from the oven and use the back of a spoon or your thumb to make small indents on the top of each cookie. Do this while they are still warm, then allow them to cool to room temperature.