Pre heat the oven to 190 and lightly grease a 20cm baking dish...
For the filling, in a bowl mix your apples, sugar, 1 tsp cinnamon and lemon juice until well combined and spread out on the bottom of your prepared baking dish...
For the topping, in a separate mixing bowl add the oats, flour, butter, sugar, cinnamon, butter and salt. You want to work the mixture to a combined consistency. From my experience, its not a bad thing if you have clumps, you just want the butter touching everything...
Put this dry mix over your apples, level out and pop into the oven until delicious. Somewhere aound 45-50 minutes...
Enjoy!...