Preheat oven to 375 degrees

In small bowl, combine corn starch and powdered sugar; stir together

In a large bowl, mix together vanilla cake mix, melted butter, oil and eggs (the consistency will be thick)

Add drops of green food coloring to cake batter until bright green color is achieved

Use small scoop or 2 spoons to gather up individual balls of dough and roll into the sugar/starch mixture until covered (avoid touching the dough as the food color may transfer to skin)

Place dough balls two inches apart on cookie sheet lined with parchment paper

Bake for 8-10 minutes, until crackled and puffed

Let cool on cookie sheet for several minutes before transferring to cooling rack