I got this recipe from Mr Food in 2011. Quick, easy, and tasty.
2 cans (21-oz each) apple pie filling
1 box (2-layer size) spice cake mix
1/2 cup butter, melted
Lightly spray the interior of the crock pot with nonstick cooking spray.
Empty both cans of pie filling into the crock pot. Spread out evenly.
In a mixing bowl, pour the melted butter over the dry cake mix; mix until crumbly.
Sprinkle the crumb mixture over the apple pie filling.
Place lid on cooker and cook on high for 2 hours or on low for 4 hours.