Preheat the oven to 350 F. In a large bowl, mix together brownie mix, eggs, and vegetable oil until smooth. In a shallow dish, combine granulated sugar and ground cinnamon.
Use a cookie scoop to form the batter into balls, roll each one into the cinnamon sugar mixture. Place the cookies onto a large ungreased baking sheet at least 2-inches apart. Bake for 10-12 minutes.