Mix together brownie mix, flour, eggs and oil with a wooden or solid plastic spoon. The batter will be very thick by the time you are done mixing.
Scoop out the cookie dough with a cookie scoop and roll the cookie dough in powdered sugar.
Set cookies 2-inches apart on an ungreased cookie sheet. Bake for 8-10 minutes until the cookies are set.
Remove the cookies and cool on the cookie sheet for 5 minutes.
Then move to a wire rack to cool completely.
Notes
*Store these cookies in an airtight container at room temperature for up to 1-2 weeks. Keep a piece of bread in the container with the cookies to keep them moist while you store them.