Preheat the oven to 350 F. In a large bowl, mix together cake mix, eggs, and vegetable oil until smooth. Add in the food coloring until fully purple. Fold in the sprinkles.
Roll the cookie dough into balls and flatten slightly. Place one peanut butter cup on each cookie dough and roll into balls. Place cookies onto a large ungreased baking sheet at least 2-inches apart. Bake for 10-12 minutes. Remove from the oven and top with candy eyes.