Bake pie according to package directions; cool completely on rack. Heat oven to 350*. In bowl, combine flour, brown sugar, granulated sugar and cinnamon. Stir in butter until combined and moist crumbs form. Press tablespoonfuls of mixture together to form large crumbs; sprinkle over pie. Bake 20-25 minutes or until crumbs are lightly browned. Cool. In small bowl, combine confectioner's sugar and 2 tsp. water until smooth. Transfer to plastic sandwich bag; snip hole in one corner. Drizzle glaze over crumbs.