Peel the apples and cut them into small parts
You can place them right away in your Pyrex or boil them for 10 minutes for a munchier and softer final texture
In your mixing bowl, add the flour, butter and sugar and combine everything with your hands until you obtain yellow crumbles
Add cinnamon on the apples and mix well using a spoon
Sprinkle walnuts cut in halves
Cover everything with the crumbs and distribute them evenly all over your plate
Preheat your oven at 180 degrees Celsius (356 degrees Fahrenheit)
Place in the oven for 35-40 minutes with convection on with your rack in the middle
Get out of the oven and allow it to cool for 10 mins and enjoy!