1. Preheat oven to 350°F. Grease bottom only of 13×9×2-inch baking pan.
2. Combine cake mix, eggs and melted butter in large bowl. Stir until thoroughly blended. (Mixture will be stiff.) Stir in chocolate chips and nuts. Press mixture evenly into prepared pan. Bake at 350°F for 25 to 30 minutes or until toothpick inserted in center comes out clean. Do not overbake. Cool completely. Cut into bars. Dust with confectioners' sugar, if desired.
Tip
For a special effect, cut a paper towel into 1/4-inch-wide strips. Place strips in diagonal pattern on top of cooled bars before cutting. Place confectioners' sugar in tea strainer. Tap strainer lightly to dust surface with sugar. Carefully remove strips.
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