Crockpot Pudding Cake

1 (18 oz) box chocolate devil's food cake mix
1 (3 oz) box instant chocolate pudding mix
2 c. sour cream
4 eggs
1 c. water
1 c. oil
1 (6 oz) pkg semi-sweet chocolate chips
Whipped cream or ice cream

In mixing bowl, combine dry cake mix, dry pudding mix, sour cream, eggs, water and oil; beat with electric mixer on medium speed 2 minutes. Stir in chocolate chips. Coat crockpot bowl with vegetable cooking spray; pour batter into crockpot bowl; cover and cook on low 4 to 7 hours. Center should be just set. Finished cake will be very moist. A toothpick inserted near center should come out with moist crumbs when done. To serve: Spoon into bowls while still hot and top with whipped cream or vanilla ice cream.