Preheat the oven to 350 F. In a large bowl, mix together brownie mix, eggs, and vegetable oil until smooth. Fold in the sprinkles. Place the powdered sugar into a shallow dish.
Use a cookie scoop to form the cookie dough into balls, roll each one into the powdered sugar. Place the cookies onto a large ungreased baking sheet. Bake for 10-12 minutes.