Preheat the oven to 375ºF. Grease an 8 or 9" baking dish with butter to keep the fruit from sticking.
Add the apples and cranberries to the greased dish and toss with arrowroot and honey to coat.
In a small bowl, combine the topping ingredients. Sprinkle over top of the fruit and pat into an even layer.
Transfer to the oven, and bake for 30 minutes or until the fruit is soft and the crisp topping is light golden brown.