Preheat oven to 350 degrees. Spray an 8 inch square baking pan with vegetable cooking spray. In a medium bowl, combine flour, cocoa, baking soda and salt. Mix well; set aside. In a large bowl, combine the sugar, egg and egg white. mix well. Whisk in the corn syrup and vanilla until well combined. Gradually stir flour mixture into the sugar mixture until smooth. Fold in chocolate morsels and walnuts. Spread batter evenly in prepared pan. Bake until mixture starts to pull away from sides of pan, about 25 minutes. Place pan on a wire rack and cool for 10 minutes. Turn out onto rack and cool completely. Cut into squares and serve.
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