In a large bowl, combine the flours, sugar, baking powder and salt.

In a small bowl, beat the egg, egg white, applesauce, milk and butter. Stir into dry ingredients just until moistened. Fold in blueberries and lemon peel.

Transfer to an 8 x 4 x 2-inch loaf pan (or 3 mini loaf pans) coated with nonstick cooking spray and flour.

Bake at 350 degrees for about 50-60 minutes, or until toothpick inserted near the center comes out clean. If using mini loaf pans, only bake about 35-40 minutes.

Combine glaze ingredients; pour over warm loaf. Cool for 10 minutes before removing from pan to wire rack to cool completely.