Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large bowl, stir together the cake mix, eggs, and oil until a smooth, glossy dough forms.
Pour powdered sugar into a small bowl. Scoop dough by tablespoonfuls and roll each ball in the sugar until fully coated.
Bake & Cool
Place cookies 2 inches apart on the prepared sheet and bake for 8–10 minutes, until cracks appear on top.
Let cookies sit on the sheet for 3 minutes, then transfer to a wire rack to cool completely.
Notes
Store cooled cookies in an airtight container at room temperature for up to 3 days. For longer storage, refrigerate up to 1 week or freeze for up to 3 months.To refresh texture, reheat cookies at 300°F for 4–5 minutes. Let them cool slightly before serving.