In medium mixing bowl, combine flours, baking soda, cinnamon and salt. Set aside.
In large mixing bowl, combine granola cereal, buttermilk, brown sugar, honey and orange juice concentrate. Let stand 5 minutes or until cereal is slightly softened.
Add egg whites and oil; mix well. Stir in flour mixture only until combined. Stir in chopped apple. Spread evenly in 9 x 5 x 3-inch pan coated with cooking spray. Sprinkle top of batter with 1 tablespoon granulated sugar.
Bake at 350° 50 minutes or until wooden pick inserted near center comes out clean. Let cool 10 minutes. Remove from pan. Cool completely before slicing.