Preheat the oven to 350 F. In a large bowl, mix cake mix with eggs, peanut butter, and vegetable oil until smooth. Fold in sprinkles. In a shallow dish, combine sugar and cinnamon.
Roll cookie dough into balls and roll each one in the cinnamon sugar mixture. Place cookies onto a large ungreased baking sheet at least 2-inches apart. Bake for 10-12 minutes.