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