Preheat oven to 350 degrees F. Line a baking sheet with parchment paper or a silicone baking mat.
Combine the cake mix powder, eggs, vegetable oil and vanilla extract in a large bowl with a sturdy wooden spoon until a soft dough forms. If desired, stir in ¼ cup sprinkles.
Scoop 1 tbsp of dough and roll into a ball, then roll in sprinkles until coated. Place on baking sheet 2 inches apart.
Bake for 9 to 10 minutes, until set and then let cool for 2 to 3 minutes on baking sheet before transferring to a cooling rack to cool completely. Enjoy!
Notes
See tips in blog post above for freezing cookie dough or baked cookies!