01 - Preheat oven to 375°F. Position rack in the center.
02 - Place the pie crust in a 9-inch pie dish, trim edges, and flute as desired. Set aside.
03 - In a large bowl, combine sliced apples, granulated sugar, brown sugar, flour, cinnamon, nutmeg, salt, lemon juice, and vanilla extract. Toss to coat apples evenly.
04 - Transfer the apple mixture into the prepared pie crust, spreading into an even layer.
05 - In a medium bowl, mix flour, brown sugar, granulated sugar, cinnamon, and salt. Add cold cubed butter and blend with a pastry blender or fingers until mixture forms coarse crumbs.
06 - Sprinkle crumble topping evenly over apple filling. Place pie on a baking sheet and bake 45 to 50 minutes until topping is golden and filling bubbles. Tent with foil if crumble browns too fast.
07 - Remove pie from oven and let cool for at least 1 hour to set before slicing.