In a bowl, combine white sugar, flour, cornstarch, cinnamon, and nutmeg.
1/2 cup granulated sugar, 2 Tbsp all-purpose flour, 1 Tbsp cornstarch, 2 tsp ground cinnamon, 1/4 tsp ground nutmeg
In a large bowl combine sliced apples and lemon juice, then add the mixed dried ingredients and, using a spatula, stir everything together until thoroughly combined. Set aside.
8 cups thinly sliced and peeled apples, 2 Tbsp lemon juice
Preheat oven to 400°F (200°C).
Place the pie crust in a 9-inch pie dish and tuck it in with your fingers. Trim excess dough if needed and flute the edges.
1 pie crust
Spoon the apple filling into the crust but leave most of the liquid in the bowl.
To make the crumble topping, combine the flour, brown sugar, cinnamon, and butter cubes in a bowl and use a fork, pastry cutter, or your hands to combine until thick and crumbly. Sprinkle topping over apple filling.
3/4 cup all-purpose flour, 1/2 cup packed light brown sugar, 1 tsp ground cinnamon, 1/2 cup unsalted butter
Place the pie dish on a large enough baking sheet covered with parchment paper and bake for 20 minutes. Then turn the temperature down to 375°F (190°C) and bake for 30 more minutes until the topping is golden brown and the filling is bubbling up. If the edges brown too quickly, cover them with a pie shield after 20 minutes.
Let the pie cool completely before cutting into it to allow the filling to thicken up. Cover leftovers with plastic wrap and store in the fridge for up to 4 days.