Preheat oven to 350 degrees F.
In a large bowl, mix the cake mix, pudding mix, oil, eggs and vanilla until completely combined and dough forms.
Stir in the 1/4 cup sprinkles and 1/2 cup chocolate chips. (I added more sprinkles than the original recipe because I LOVE sprinkles and it makes them more fun!)
With a cookie scoop or just a spoon, scoop cookie dough balls onto baking sheets. Use the remaining 1/4 cup white chocolate chips to press into the tops of each cookie to make them look even tastier.
Bake for 8-10 minutes, or until slightly golden brown. The centers will still be very soft. Cool for at least 10 minutes before serving.