Preheat the oven to 425°F (220°C)
Prepare pie crust dough
Peel, core, and slice apples
Mix apples with sugar, cinnamon, nutmeg, lemon juice, and flour
Roll out one pie crust and place it in a pie dish
Add the apple filling
Dot the filling with butter
Cover with the second pie crust or make a lattice top
Seal and crimp the edges
Cut small slits in the top crust if needed
Brush the top with egg wash and sprinkle with sugar if desired
Bake for 15 minutes
Reduce oven temperature to 375°F (190°C)
Bake for 35 to 45 minutes more until the crust is golden and filling is bubbling
Cool before slicing and serving