Spray the inside of your slow cooker with cooking spray.
Combine the ingredients of the cake mix layer in a large bowl. Using a handheld or stand mixer, beat the ingredients until smooth and mixed in completely, around 2 minutes. Pour into the bottom of the slow cooker.
In a medium bowl, combine the pudding mix and 3 cups of milk. Mix according to the package directions. Pour on top of the cake batter.
Remove the icing lid and microwave for 10-15 seconds until it is pour-able. Pour evenly on top of the pudding.
Sprinkle the chocolate chips on top of the mixture in the crockpot.
Place the lid on top and cook on high for 3- 31/2 hours or until the cake has cooked in the middle completely. You can also cook this low and slow for 4-5 hours. The cake is done when you can insert a knife in the middle of the CAKE only and it comes out clean. Don't pierce through to the pudding!
Remove and serve hot with vanilla ice cream on top.