Preheat the oven to 400°F.
Roll out your chilled pie dough into a 12- to 14-inch circle. Transfer the dough to a 9-inch pie dish. Trim the edge of the dough to a 1-inch overhang, then fold the excess under and crimp the edge. Freeze while you make the filling.
Combine the flour, sugar, cinnamon, and salt in a small mixing bowl. Pour in the melted butter then mix until large clumps form. (If the butter is too warm the mixture will form a glob instead of crumbles. Just pop in the fridge to chill a few minutes if needed and then break it up with your hands.)
Peel, core, and slice your apples, then toss with the lemon juice in a large mixing bowl. Add the sugar, flour, cinnamon, and nutmeg then toss to combine evenly. Pour the apples into the frozen pie crust, pressing them down into the crust and mounds them slightly in the center. Place the pie on a rimmed baking sheet.
Bake for 20 Minutes. Reduce the oven temperature to 350°F.
Remove the pie and sprinkle the crumble topping over the apples. Continue baking for 1 hour minutes or until the crust is golden brown, the filling is bubbly, and the apples are soft when a skewer is poked in the center. Tent the pie or crust with foil at any point if it appears to be browning too quickly. Let the pie cool completely at room temperature, about 4 hours, before slicing.
