Preheat your oven to 450°F (230°C).
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 the apples into thin slices (about ⅛ inch thick).
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).
Bake at 450°F (230°C) for 15 minutes, then reduce the heat to 350°F (175°C) and continue baking for 45–55 minutes, until the apples are soft and the topping is golden brown.
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!