In a large mixing bowl combine the brownie mix, vegetable oil, and eggs. Use a spatula or wooden spoon to combine.
Use a cookie scoop or large spoon to drop the batter onto parchment paper lined baking sheets, spacing them about 3 inches apart. (20-24 cookies total)
Break the Oreos into pieces or crush them and sprinkle on top of each cookie.
Bake at 350 for about 8-10 minutes.
Let cool for 5 minutes before removing from the baking sheet.
Enjoy warm or store in air tight container after they are cooled completely.