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PREHEAT oven to 350 degrees. Lightly grease a 9-inch-by-13-inch pan.
BLEND flour, baking soda and salt in a small bowl. Set aside.
CREAM butter, sugar and vanilla until light and fluffy, about 2 minutes. Stop to scrape down sides twice. Add eggs and mix until blended. Add the dry ingredients and mix on low speed until almost blended. Stop to scrape down bowl.
ADD chocolate chips and nuts and mix on low speed for 5 seconds. Finish mixing by hand with a wooden spoon. Spread the batter evenly in prepared pan.
BAKE on center rack until top has formed a golden crust and dropped below the level of the darker golden outer edges, about 30 minutes. Cool 30 minutes in the pan on a rack before cutting. Yield: 16-20 servings