Spray 7 x 11 biscuit pan or brownie pan with butter flavored spray.
In large bowl combine butter, splenda, eggs with whisk. Stir in applesauce and vanilla.
In small bowl combine flour, cocoa, baking powder and salt. Add flour mixture to butter mixture and mix gently just to combine. Fold in walnuts. Spread in pan and bake on 350 degrees for 20-26 minutes or until toothpick comes out clean. Cool on wire rack!