4 Granny Smith apples (about 800g in total), peeled, cored
2 cups frozen mixed berries
⅓ cup caster sugar
Cream, custard or ice‑cream, to serve
1 cup plain flour
120g butter, chilled, chopped
½ cup brown sugar
½ cup rolled oats
1 tsp ground cinnamon
Preheat oven to 180°C. Cut apples into 2cm cubes and put in a small roasting pan or slice tin (about 30 x 20cm). Add berries and sugar and toss to combine, then cover with foil. Put pan in a larger oven tray to catch any cooking juices. Bake for 20 minutes.
Meanwhile, to make crumble topping, put flour in a large bowl. Add butter, rubbing together with fingers until it resembles coarse breadcrumbs. Add remaining topping ingredients and rub together.
Remove pan from oven and discard foil. Spread topping evenly over fruit to cover. Bake for a further 35 minutes or until topping is golden and fruit is bubbling.
Allow to cool for five minutes. Serve warm with cream, custard or ice-cream.