Preheat the oven to 350°. Place the salt and 2 cups flour in a food processor and pulse until blended.
Add 1 cup butter and pulse until the butter is the size of peas. While pulsing, add just enough ice water to form moist crumbs.
Press the mixture onto the bottom of a greased 13x9-inch baking pan. Bake until the edges are lightly browned, for about 20 to 25 minutes. Cool on a wire rack.
In a large bowl, combine the apples, 1 cup sugar and cinnamon; toss to coat. Spoon over the crust.
Place the remaining flour, butter and sugar in the food processor and pulse until coarse crumbs form. Sprinkle over the apples.
Bake until golden brown and the apples are tender (60 to 70 minutes). Let cool completely on a wire rack. Cut into bars.
