I used up a jar of apple pie filling last night by baking up an apple crisp. I went way too heavy on the crisp part so I'm adjusting the recipe down by a bit but here it is:
1 jar apple pie filling
1/2 cup brown sugar
1/2 cup flour
1/2 cup butter
1/2 cup rolled oats1/2 cup chopped walnuts
Blend the brown sugar, flour and butter until the butter is in pea sized chunks - you can use a food processor for this but I just used a pastry blender. Add the oats and nuts. Pour the apple pie filling into an 8 x 8 Pyrex and add the crisp topping. Bake at 350 for 20 - 25 minutes.