Modified from Sandra Lee

cooking spray

2 (21 oz) cans apple pie filling

1/2 tsp cinnamon

3 packets instant apple-cinnamon oatmeal, divided [She used one with raisins and spice, but I don't like raisins, so I changed it and then just reduced the amount of cinnamon in the recipe to account for the fact that there was extra cinnamon in my oatmeal]

6 tbsp butter, divided

Preheat oven to 375.  Spray a 9 by 13 casserole dish with cooking spray (she used butter flavored...I say, who cares and I have regular always in the house). 

Spread half of the apple pie filling in the bottom of the casserole dish.  Sprinkle with cinnamon and 1 1/2 packets of oatmeal.  Dot with half hte butter.  Repeat with rest of ingredients. 

Cover with foil and bake for an hour.  Remove from oven and let sit for 5 minutes to before serving.  Can serve hot or cold.