Prepare cake mix into batter using eggs, oil, and water. Pour into crock-pot.
Prepare Jell-O Chocolate Instant Pudding Mix using milk. Pour this over cake mix in crock-pot. Sprinkle chocolate chips all over the top of the batter.
Cook in crock-pot on high setting for 2 1/2 to 3 hours until cake is moist but not jiggle, and little volcanoes of spitting chocolate appear on top. Serve with ice cream, whipped topping, or on its own for a really special dessert.