Preheat the oven to 350 F. In a large bowl, whisk together cake mix, eggs, and vegetable oil until smooth. Fold in the Valentine's day themed sprinkles.
Roll the cookie dough into balls, and place them onto a large ungreased baking sheet at least 2-inches apart. Bake for 10-12 minutes. Remove from the oven, and place one heart chocolate on each cookie.