Preheat the oven to 350 F. In a large bowl, mix together cake mix, oats, peanut butter, eggs, and vegetable oil until smooth. Fold in chocolate chips and M&Ms.
In a shallow dish, combine granulated sugar and ground cinnamon. Roll the cookies into the cinnamon sugar mixture. Place cookies onto a large ungreased baking sheet at least 2-inches apart. Bake for 10-12 minutes.