Separate juice from the apple pie filling

Put the shell in a pie plate and pour the filling unit until reaches the top

Mix butter, oats, brown sugar and filling juice. Stir it well and let it sit for about 15 minutes

Spread the crumble on top of the pie

Heat up the oven to 400 degrees and bake the pie for 45-55 minutes (until crust gets golden)

Let it sit for 30 minutes and serve with your favourite ice cream or whipped cream