Take one tablespoon of your softened butter and spread all around the bottom and sides of your crock pot
In a bowl, mix together your apple pie filling, 3 tablespoons of brown sugar and 1 teaspoon of cinnamon
Take 1/2 of your apple mixture and spread across the bottom of your crock pot
In a different bowl, mix together your dry cake mix, eggs, sour cream, evaporated milk, 4 tablespoons of butter and the rest of your cinnamon very well
Take 1/2 of your batter and gently spread over your apple mixture
Repeat your layers
Cut together your remaining butter and brown sugar and sprinkle on top
If you want pecans, sprinkle those on top of everything
Place 2-4 paper towels under your lid, cover and cook on high for 4-6 hours until cake is done in the middle
Periodically check your paper towels to make sure they are not dipping down into the cake and remove moisture from your lid.