Summer Sale Offer!
Try 3 issues of BBC Wildlife Magazine for just £5
Preheat the oven to 180oC/350oF/Gas 4. Place the chopped apples with the blackberries, sugar, cinnamon and vanilla extract in a heavy bottomed pot. Mix well and cook for 5 minutes over a medium heat.
Meanwhile, make the topping by mixing the flour, sugar and cinnamon in a small bowl. Rub the butter into the mix until it resembles breadcrumbs, then mix in the oats.
Spoon the fruit mixture into the ovenproof dish and sprinkle the crumble on top. Bake for 15–20 minutes until golden and bubbling.