PREHEAT oven to 375°F. Brush pie crust lightly with some of the egg white. Bake 5 minutes; cool.
SPOON pie filling into crust. Mix flour, granulated sugar and cinnamon in medium bowl. Cut in butter until mixture resembles coarse crumbs; stir in pecans. Sprinkle over pie filling.
BAKE 25 to 30 minutes or until topping is golden brown. Cool slightly on wire rack. Sprinkle with powdered sugar.