1.Preheat oven to 350 degrees, spray a 9 x 9 baking pan with cooking spray and set aside.
2.In a large mixing bowl, toss in dry cake mix, dry pudding mix and whisk until all clumps are gone. Add vanilla extract into milk and pour into bowl. With a large wire whisk, mix until completely combined. Toss in chips and sprinkles. Save some for topping.
3.Spread evenly into prepared pan and bake for about 30 to 35 minutes until lightly browned. When you touch the cake lightly it should slightly spring back and then check with a toothpick.
4.Sprinkle the remaining chips with a sprinkles. Let cool for at least 30 minutes. Enjoy!