Instructions: Preheat oven to 350 degrees.

In large bowl of electric mixer, cream butter, sugar, salt, vanilla and egg yolk until smooth. Gradually add flour, beating until just blended.

Spread mixture evenly in greased, shallow 10-by-15 baking pan. Bake until well browned, about 15 to 20 minutes. Watch carefully to prevent burning.

Remove from oven. Sprinkle chocolate chips evenly over surface. Let pan cool on wire rack 10 minutes while chocolate chips melt, then spread them evenly over surface with a spatula. Garnish with walnuts.

Let cool completely before slicing into diamonds. About 45

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