Spray the crockpot or slow cooker with non-stick cooking spray or use a liner.
Add the apple pie filling on the bottom of the pot.
In a large bowl, combine the cake mix, brown sugar, and cinnamon.
Sprinkle the cake mix mixture on top of the apple pie filling.
Melt the butter in a microwave-safe bowl and drizzle over the cake mix evenly.
Place a paper towel on top of the crockpot or slow cooker and add the lid. The paper towel needs to be pulled tight, then the lid on top to make it nice and tight.
Set to high for 3 hours.
Serve warm with vanilla ice cream and caramel sauce.
These instructions will work for the Ninja Foodi using the slow cooker function, I did have to cook it on High for 4 hours in the Ninja Foodi, then I baked it at 350 degrees for about 5 minutes to get it browned on top.