Preheat oven to 350. Spray an 8 inch square baking pan with vegetable cooking spray and set aside.

In medium bowl combine flour, cocoa and salt. Mix well. In a large bowl, whisk together egg whites, egg, sugar, applesauce, oil and vanilla. Stir in flour mixture until just blended; do not overmix. Pour batter into prepared pan; sprinkle with walnuts.

Bake until just set and a toothpick inserted in center comes out clean, about 25 minutes.

Place pan on a wire rack and cool for at least 15 minutes. Cut brownies into squares and place on a serving plate.

For chewier brownies, replace the 1/2 cake flour with 7 tablespoons of all-purpose flour, Sifting is not necessary.