In a large bowl, mix well to combine cake mix, eggs, and vegetable oil.
Place dough in the refrigerator for at least 30 minutes to chill.
Preheat oven to 350℉. Line cookie sheets with parchment paper.
Form dough into 1-inch balls. Roll in powdered sugar, if desired. Place balls of cookie dough on baking sheets at least 2 inches apart.
Bake 10 to 12 minutes. Cool on cookie sheets for 5-10 minutes before transferring to a wire rack to cool completely.
