Line cookie sheets with parchment paper, set aside
In a large bowl, combine the cake mix, Cool Whip, and egg, stir well until a sticky dough forms; this will take a few minutes of stirring
Pour the powdered sugar out onto a plate
Use a cookie scoop or melon baller to create 1-inch balls of dough and drop them onto the plate of powdered sugar a few at a time
Roll the balls in the powdered sugar then place them on the prepared cookie sheets, leaving at least 1 ½ inches of space between each cookie dough ball
Repeat this process until all the dough is turned into balls and rolled in the powdered sugar
Bake the cookies at 350F for 8-10 minutes until set
Cool the cookies on the cookie sheets for 5 minutes, then transfer to a wire cooling rack to finish cooling