For the filling you’ll need: 5 Granny Smith Apples, 1 tub fresh blueberries, 100g golden brown sugar, 1 tsp ground cinnamon. For the crumble topping you’ll need: 150g Quick Cooking Oats. 125g soft brown sugar, 50g cake flour, 1 tsp ground ginger, 100 g cold butter - grated. Method.  Preset the oven to