1. Prepare the Pie Crust:

1. In a mixing bowl, combine flour and salt.
2. Cut in the cold butter using a pastry cutter or fingers until the mixture resembles coarse crumbs.
3. Add ice water, 1 tablespoon at a time, mixing gently until the dough starts to come together.
4. Form the dough into a ball, wrap it in plastic wrap, and chill for at least 30 minutes.
5. Roll out the dough on a floured surface to fit a 9-inch pie pan. Transfer the crust to the pan and trim any excess dough.

2. Make the Apple Filling:

1. In a large bowl, toss the sliced apples with granulated sugar, brown sugar, flour, cinnamon, nutmeg, vanilla extract, and lemon juice.
2. Let the mixture sit for 10-15 minutes to allow the apples to release their juices.
3. Pour the apple filling into the prepared pie crust and drizzle with melted butter.

3. Prepare the Streusel Topping:

1. In a medium bowl, mix the flour, brown sugar, and cinnamon.
2. Stir in the melted butter until the mixture forms crumbs.
3. Sprinkle the streusel evenly over the apple filling.

4. Bake the Pie:

1. Preheat oven to 375°F (190°C).
2. Place the pie on the middle rack and bake for 45-50 minutes, or until the topping is golden brown and the apples are tender.
3. If the crust or topping starts to brown too quickly, cover the edges with aluminum foil.
4. Allow the pie to cool for at least 30 minutes before serving.