Ingredients: adapted from here (modified slightly)
Apple filling: 5 Gala apples, peeled and chopped 1 ½ tbs unsalted butter, room temperature ½ tsp ground cinnamon
Crumble topping: 185g Self raising flour 1 teaspoon baking soda 130g unsalted butter, room temperature 140g brown sugar
Base: 100g unsalted butter, room temperature 80g brown sugar 1 egg 150g self raising flour, sifted 1/2 tsp baking soda, sifted 1 tablespoon milk icing sugar, to dust (i omit)
Preheat oven to 160ºC/320ºF; butter a 20x30cm (8x12in) pan and line with non-stick baking paper or foil (if using foil, butter it, too) extending paper/foil over the edges of pan.
Start by making the filling: place the apples, butter and cinnamon in a saucepan over low heat and cook for 5 minutes or until softened. Allow to cool.
Now, the crumble: combine flour, baking powder, butter and sugar in a bowl and mix using your fingertips until mixture resembles breadcrumbs. Set aside.
Make the base: place the butter and sugar in an electric mixer and beat until creamy. Add the egg and beat well. Fold through the flour, baking powder and milk. Spread into prepared pan – it will be a thin layer - top with the apple filling and crumble and bake for 40 minutes until golden. Allow to cool, unmold using the foil “handles” and cut into squares. Dust with icing sugar to serve.
Serves 6-8 – I made ¾ of the recipe above, used a 20cm square pan and got 16 bars