Preheat oven to 350°F. Lightly butter a 15x10x¾-inch jelly roll pan.
Combine flour, 1 cup of the sugar, 1 Tablespoon cinnamon and baking powder. Set aside.
Beat butter, 1 whole egg, egg yolk, water and vanilla. Blend in dry ingredients.
Spread batter evenly in prepared pan.
Beat egg white slightly; brush over mixture in pan. Combine ¼ cup sugar, 1 teaspoon cinnamon, chocolate pieces and nuts. Sprinkle over top.
Bake for 20-25 minutes (don’t over bake). Cool. Cut into 2½x1-inch bars.