In the bowl of a food processor fitted with a metal blade, place the flour, salt, and butter cubes. Pulse until coarse crumbs are formed. Pulse in cold water until the dough easily holds together.
Pat these crumbs into the bottom of a 9x13-inch pan. You can use a butter wrapper to press and keep the crumbs from sticking to your hand.
To make the apple filling
In large mixing bowl, combine apple slices, sugar, lemon juice and cinnamon. Spread this mixture in an even layer over crust.
To make the top crust
In the food processor, combine the flour, butter, and brown sugar, pulsing until coarse crumbs are formed, or in a large mixing bowl, combine these ingredients, cutting butter into sugar and flour with a pastry blender or two knives held together. Stir in nuts. Sprinkle crumb top over apple layer.
Preheat oven to 375°. Bake for 45 minutes to an hour or until filling bubbles. Cool completely.
Video
Notes
If preparing ahead of time to freeze. Wrap with foil and label prior to baking and freeze. Then, when ready to serve, bake the frozen pie at 425° for 15 minutes. Reduce heat to 375° and continue baking as directed.Promptly store leftovers in an airtight container in the refrigerator, for up to 3 days.Nutritional values are approximate and based on 1/12 the recipe.Prep tips:
If you don't have a food processor, you can use a pastry blender, fork, or two knives to cut the butter into the flour.