In a large mixing bowl, toss your sliced apples with the sugar, flour, lemon juice, zest, cinnamon, nutmeg, and salt. Let the mixture sit for 20–30 minutes. > Why: This draws out the excess moisture that usually makes the bottom crust soggy.
Preheat your oven to 400°F (205°C). Place your prepared pie crust into the 9-inch glass dish. Crimp the edges.Pro Tip: For extra insurance, brush the bottom of the crust with a lightly beaten egg white. This creates a waterproof seal. In a mixing bowl, combine the flour, brown sugar, granulated sugar, and cinnamon.
Add the chilled, cubed butter and use a fork to cut it into the dry ingredients until the mixture becomes crumbly.
Peel, core, and slice your 8 Granny Smith apples into thin, uniform ⅛-inch slices.
In another bowl, toss the apple slices with granulated sugar, flour, lemon juice, lemon zest (optional), cinnamon, and nutmeg until well coated.
Place the prepared pie crust into a 9-inch pie dish.
Layer the apple mixture into the pie crust, filling it to the top.
Pour any leftover juice from the apple mixture over the apples.
Spread the crumble topping evenly over the apples, pressing it down lightly.
Place the pie pan on a cookie sheet (to catch any drips).
Place the pie on the preheated cookie sheet. Bake at 400°F for 20 minutes to set the pastry. Lower the oven to 375°F (190°C). Continue baking for 35–45 minutes. If the crust edges are browning too quickly, protect them with aluminum foil.
To ensure the apples are cooked, poke the center of the pie with a fork or knife and check if they are soft all the way through.
Allow the pie to cool slightly before serving. Serve warm or at room temperature. Enjoy with a scoop of vanilla ice cream for an extra treat!