1 c. brown sugar
1 c. butter
1 egg yolk
1 tsp. vanilla
2 c. flour
1/2 tsp. salt
8 oz. Hershey bar

Mix together; press into greased 13x9 pan. Bake at 350 degrees for 15-20 minutes. Cool slightly. Melt 8-ounce Hershey bar in double boiler; cut into bars.