Preheat oven to 350 degrees.
Line a baking sheet with parchment paper.
In a mixing bowl combine the cake mix, whipped topping, 1egg, lemon zest, and lemon juice. Using a spatula, stir all the ingredients until you get a very sticky dough consistency.
Using a small cookie scoop, scoop out one dough ball and drop it into the powdered sugar. Roll it in powdered sugar until coated and place on the parchment-lined cookie sheet.
Bake in the oven for 10-12 minutes, until set.
These cookies are perfect hot out of the oven or if you can wait, perfect for a special treat. They also freeze for up to two months.