- Mix dry cake and pudding mixes in large bowl with whisk until blended.
- Add next 4 ingredients; mix well.
- Stir in chopped chocolate. Pour into slow cooker lined with foil and sprayed with cooking spray; cover with lid.
- Cook on LOW 4 to 5 hours (or on HIGH 3 to 3-1/2 hours) or until top surface of cake has no wet spots and cake begins to pull away from side of slow cooker. Serve warm topped with COOL WHIP