Apple Crumble Slice

I got this recipe out of a Recipes+ Magazine.....I also added extra brown sugar and cinnamon.

Ingredients

1. 1 kg (5) Granny Smith apples, peeled, cored, roughly chopped
2. 1/3 cup firmly packed soft brown sugar
3. 2 1/2 cups plain flour
4. 1/2 cup icing sugar mixture
5. 230g cold butter, chopped
6. Iced water
7. 3/4 cup rolled oats
8. 1/2 cup chopped walnuts
9. 1/2 teaspoon ground cinnamon

How to

1. Place apples in a saucepan; add half the brown sugar and 1 teaspoon tap water, Cover; bring to the boil. Reduce heat; simmer for 15 minutes. Uncover, simmer, stirring often, until liquid evaporates. Cool.
2. Preheat oven to 180*C/160* fan forced. Grease and line a 30 x 20 cm lamington pan with baking paper. Place flour, icing sugar and 200g butter in a food processor, pulse until crumbly. Add 3 tablespoons Iced water: pulse until mixture forms small clumps, add 1 more tablespoon if needed. Place 1/3 crumble mixture in a bowl; cover and chill, knead remaining mixture into a dough: press evenly in base of pan.
3. Line pastry with baking paper; bake blind for 10 minutes. Remove weight and paper; bake for 10 minutes more or until pale golden. Cool. Spread apple over pastry.
4. Add oats to chilled crumble with walnuts, cinnamon and remaining brown sugar. Rub in 30g butter to make coarse crumbs; sprinkle over apple. Bake for 20 minutes or until golden . cool slightly before cutting.