Place LUCKY LEAF Premium Strawberry Pie Filling in a 3 1/4 to 4-quart slow cooker.
Combine dry cake mix and butter thoroughly, using fingers if necessary. The mixture will be crumbly. Sprinkle over pie filling.
Cover and cook on low-heat setting for 2 to 3 hours.
Sprinkle with chocolate pieces and serve warm. Garnish with chopped nuts or whipped cream, if desired.