Apple Crisp

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 oats
1/2 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.