Preheat oven to 350 degrees. Grease an 8 x 8 inch baking dish.
In a large mixing bowl, add sliced apples, cranberries, and lemon juice. Stir to evenly distribute lemon juice. Add remaining filling ingredients and stir well. Transfer fruit filling to baking dish and set aside.
Using the same mixing bowl (now empty), add in oats, flour, pecans, cinnamon, salt and maple syrup. Stir well to mix. Drizzle with melted butter and stir well to evenly coat. Pour crumble topping over fruit mixture and spread evenly.
Loosely cover baking dish with aluminum foil and place in preheated oven. Bake for 25 minutes. Remove aluminum foil and bake an additional 30 minutes to allow crumble topping to crisp and slightly brown.
Remove from oven. Serve warm with whipped cream or ice cream.
