1/2 lb. butter
1 c. brown sugar
1 egg yolk
1 c. flour
6 Hershey's bars
1/2 c. walnuts

Cream butter, sugar, and egg yolk; add flour last. Spread in jelly roll pan and bake at 350 degrees for approximately 12 minutes. Watch and do not overbake. When you take it out of the oven, top with broken pieces of Hershey's bars and spread around as it melts. Top with chopped walnuts.