Preheat oven to 375 degrees.
In a large mixing bowl, combine cake mix, butter and water. Add eggs; mix well.
Shape into 1-inch balls and roll in powdered sugar. (The dough will be sticky, so the easiest way to do this is to drop spoonfuls of dough into the powdered sugar and start rolling it into a ball in there.)
Place 2 inches apart on greased baking sheet.
Bake for 9-11 minutes or until set. Immediately press a mint into the center of each cookie. Cool for 2 minutes before removing to wire racks to cool completely.