Cranberry Apple Casserole

Preheat oven to 350 degrees F (175 degrees C).
Combine apple pie filling and cranberry sauce in a shallow baking dish.
In a medium bowl, mix the butter, oats, and brown sugar until crumbly. Sprinkle evenly over the fruit mixture.
Bake in the preheated oven for 40 minutes, or until browned and crisp.