Mix cake mix, oil, and eggs together. Drop spoonfuls of dough onto baking sheet.
Bake for 6-9 minutes (do not overbake).
Take sheet out of oven and while the cookies are still very hot, place a thin mint patty on top of each cookie. Let cookies cool, then melt chocolate chips in microwave and drizzle on top of each cookie.
Notes
You can add green food color to the chocolate chips to make them more festive.