Place pie filling in the slow cooker. Combine dry cake mix and butter, sprinkle over filling. Sprinkle the walnuts on top of that. Cover and cook on low for 2 to 3 hours. Serve warm in bowls.
Top with whipped cream or vanilla ice cream.
*Best made in a 3-4 quart crock pot
Notes
**Gluten Free** Use a gluten free cake mix (keep in mind they are typically smaller than regular cake mix so you may need more than one. **Dairy Free** Substitute dairy free margarine instead of butter