In a large bowl using an electric mixer, mix together boxed cake mix, melted butter, eggs, and vanilla extract; mix until combined.
Place granulated sugar and powdered sugar in separate shallow dishes. Scoop dough into tablespoon balls using a #50 disher; drop into granulated sugar and roll to coat. Transfer dough balls to powdered sugar and roll to coat. Evenly space dough balls on a silicone mat-lined baking sheet.
Bake 9-11 minutes, until puffed and cracked, and edges have begun to set but centers are still soft; cookies will look raw between cracks and seem underdone.
Cool cookies on a baking sheet on a wire rack for 5 minutes; transfer to a wire rack to cool completely. Eat & Enjoy!
Notes
Store Dark Chocolate Crinkle Cookies in an airtight container; will keep for 3+ days.