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