
Preheat the oven to 350 degrees and prepare a 9x13 inch baking pan with a light coating of cooking spray. Set aside.
In a large bowl, combine cake mix, water, vegetable oil and eggs. Mix until thoroughly combined.
Pour batter into the prepared baking pan and bake for 25 minutes or until a toothpick inserted in the center comes out clean.
Allow the cake to cool, then using the handle of a wooden spoon poke holes over each inch of the cake. Set aside.
In a medium bowl, combine the pudding mix and milk. Whisk together until smooth.
Pour pudding over cake and spread evenly.
Place the cake into the refrigerator and let it cool for 1 hour.
Whisk together the instant pudding mix, cocoa powder and milk until thickened. Gently fold in the Cool Whip until combined.
Carefully spread the whipped topping over the pudding layer. Sprinkle with chocolate chips and drizzle chocolate syrup over the top.