Line the slow cooker with parchment paper, a liner, or grease it very well. Pour the apple pie filling in the bottom of the insert In a separate bowl, cut in the butter with the cake mix. Keep combining the butter in the cake mix until its like coarse pebbly sand. Sprinkle with the cinnamon, mix well Sprinkle the cake mix over the apple filling.Cook on high for 2 hours or low for 4 hours.
Serve warm or cold with whipped cream or a scoop of vanilla ice cream. Enjoy!