Prepare thinly sliced apples, lemon juice, white sugar, all-purpose flour, ground cinnamon, ground nutmeg, raisins, chopped walnuts, pie shell, brown sugar, and butter.
Preheat the oven to 375°F (190°C).
Place the thinly sliced apples in a large bowl and sprinkle with lemon juice to prevent browning.
In a small bowl, mix together white sugar, flour, cinnamon, and nutmeg. Sprinkle this mixture over the apples and toss until evenly coated.
Stir in raisins and chopped walnuts to the apple mixture for extra flavor and texture.
Transfer the apple mixture into the pie shell, spreading it out evenly.
In a small bowl, mix flour and brown sugar. Blend in butter with a fork until the mixture is crumbly.
Sprinkle the crumb topping evenly over the apple filling in the pie shell.
Loosely cover the top of the pie with aluminum foil and bake in the preheated oven for 25 minutes.
Remove the foil and continue baking until the top is golden brown and the filling is bubbly, about 25 to 30 minutes more.
Allow the pie to cool on a wire rack before serving to allow the filling to set.
Slice and serve this delightful Apple Crumb Pie, perfect for any occasion or as a comforting dessert. Enjoy the delicious crunch!