In a large bowl, mix together the cake mix and baking powder. Set aside.

In a smaller bowl, whisk together the eggs, oil, and vanilla by hand. Add the egg mixture to the cake mixture and stir to form a dough- stir vigorously until all of the pockets of dry cake mix are gone. Gently mix in the sprinkles- you don't want to dye the cookie dough by over stirring the sprinkles.

Drop rounded 1-inch balls of dough onto the prepared baking sheet. Bake for 9 minutes- 11 minutes. They should just be light in color. Cool on the baking sheet for 5 minutes they will be very soft at first.

Transfer to a wire rack to cool completely. Store in an airtight container, for up to one week.