Preheat your oven to 375 degrees F. Place the pie crust into a 9-inch pie plate and crimp the edge using your fingers or a fork. Set aside.
In a large mixing bowl, stir together the apple slices, lemon juice, sugar, brown sugar, flour, cinnamon, and nutmeg until the apples are well coated.
Place the apples into the pie crust and spread them to create a somewhat even top layer. Set aside.
In a medium mixing bowl make the crumb topping. Stir together the flour, brown sugar, and cinnamon until combined. Pour the melted butter into the bowl and stir everything together with a fork until it forms crumbles. Make sure all the butter moistens all the dry ingredients.
Add the crumble on top of the apples. It seems like a lot of topping, but use it all.
Cover the pie loosely with foil and bake for 30 minutes. Remove the foil and continue to bake for another 15-20 minutes until golden brown on top.
Remove the pie from the oven and let it cool completely before slicing, about 3-4 hours.
Notes
You can use unsalted butter if you don't have salted butter. Be sure to add 1/4 teaspoon salt to the crumb topping dry ingredients before mixing in the butter.
I used Granny Smith apples, but you can use any baking apple you prefer. We like Honeycrisp, Golden Delicious, Pink Lady, or Braeburn apples for this recipe too.
If you don’t like nutmeg, you can leave it out. No need to substitute anything for it.
Store any leftovers in the fridge for up to 4 days or freeze for up to 3 months. Reheat slices in the microwave for 10-15 seconds.