Preheat oven to 350 degrees.
Grease a 9 x 13 inch metal pan.
In a large mixing bowl mix together oil, eggs, vanilla, and water.
Add cake mix and mix together by hand until well blended.
Fold in chocolate chips.
Spread in the bottom of your pan and bake for about 15 minutes or until golden.
In a large mixing bowl mix together cream cheese, cool whip, and sugar.
Mix with hand mixer on high until smooth. (You may need to make two batches if you have a deep pan.)
Spread evenly over cookie bottom and refrigerate for 2 to 3 hours.
Serve and enjoy!