INSTRUCTIONS

1. Arrange rack in center of oven, then preheat to 350°F.
2. For the apple-plum filling, add all ingredients to a large bowl. Stir until fruit is well coated and mixture is fully combined. Set aside and let stand while preparing filling.
3. For the crumble topping, combine flour, oats, sugars, and salt in a small bowl. Using fingers, crumble in ½ cup butter until mixture forms small clusters with some sandy texture. Set aside.
4. Scrape fruit mixture and any juices into an 11 x 8-inch (2.3 L) oval baking dish. Scatter over remaining 2 tbsp butter. Sprinkle crumble topping over fruit mixture, ensuring fruit is evenly covered
5. Bake in the center of oven until the topping is golden-brown and edges are bubbling, approximately 1 hour to 1 hour 10 minutes. Transfer to a rack to cool slightly, about 20 minutes.
6. To serve, divide crumble between plates and top with a scoop of vanilla bean ice cream. Serve immediately.