Peach Crumb Slab Pie

Having some canned peach leftover I am making this Peach Crumb Slab Pie for afternoon snack.  

Ingredients:
(1)  Crust
1/2 cup rolled oats
1 cup plain flour
115 g. butter (cold)
1/4 cup caster sugar
1 - 2 tbsp ice water (if needed)

(2)  Filling
2 peaches (drained and sliced)
1/2 tbsp caster sugar
1 tbsp plain flour

Methods:

1. Whisk flour, oat and sugar in a bowl.
2. Cut butter into small cubes and add into dry ingredients.
3. Use fingertips quickly rub in the butter until resemble breadcrumbs.
4. Gradually add a tablespoon ice water at a time, use fingers to press the crumbs firmly together to form a dough.
5. Wrap dough in plastic wrap and leave in the fridge to chill for 30 minutes to 1 hour.
6. For the filling, combine sliced peaches with sugar and plain flour.
7. To prepare the crust for baking, I take a portion of the pastry dough, press into a pie dish about 1/2cm thick, patching with additional pastry dough as needed until the whole pie dish is covered.
8. Spoon filling into the pie dough.  Crumb the balance of the pastry over the filling.
9. Bake in a preheated oven of 180 degree Celsius for about 30 minutes until topping is crisp.
10. Cool on a wire rack.
11. Slice and let's enjoy an afternoon snack....

Recipe adapted from Treat and Trick with amendments.