Instructions: Preheat oven to 350 . Cream butter and sugar in bowl. Add egg yolk and mix well. Add vanilla, then flour. With floured fingertips, pat dough into bottom of 15 1/2" x 10 1/2" cookie sheet with sides. Bake in preheated oven until edges are slightly browned, about 18 to 20 minutes. Remove pan from oven, and immediately lay Hersheys bars on top. When chocolate is melted, spread as you would frosting. Sprinkle with chopped nuts. Cool; cut into bars.

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