Preheat the oven to 350 degrees. Line two baking sheets with parchment paper and set aside. In a medium bowl, whisk together the powdered sugar and cornstarch. Set aside.
In a large bowl, beat the eggs, then added cooled melted butter, lemon zest and cake mix. Mix by hand until combined.
Roll into 1-inch balls. Roll each ball in the powdered sugar mixture then place on a prepared baking sheet about 2-inches apart.