If you are using a homemade pie crust make that first, or take a frozen one out of the freezer. Use a 9-inch pie plate.
In a small bowl whisk together the dry filling ingredients, the flour, sugar, cinnamon, nutmeg, and optional lemon zest.
Wash and peel the apples. Then core and cut them into thin slices no more than 1/8th of an inch thick. Place the apple slices in a large bowl and pour the lemon juice over them. Then sprinkle on the dry filling mixture and stir until all the apples are evenly coated.
Make the crumb topping by adding the flour, white sugar, brown sugar, and cinnamon to a bowl and mixing them together. Then add the softened butter and mix with a fork or pastry blender until it resembles large crumbs.
Place the pie crust and pie pan on top of a sheet pan. This is optional but helps when taking the pie out of the oven. Layer the slices of coated apples in the crust, until it is mounded. Don't just dump all the apples in, that creates too many air pockets. Then sprinkle the apple crumb topping on top evenly. Bake the pie for 15 minutes at 450 F/232 C. Then cover with foil and reduce the heat to 350 F/176 C. and bake for 45 to 55 minutes until golden brown on top.
Once the pie comes out of the oven allow it to cool for 45 minutes or so before serving it. Enjoy!