1 c. butter
1 c. dark brown sugar
1 egg yolk
2 c. flour
1/2 tsp. salt
1 tsp. vanilla
6 to 8 oz. Hershey chocolate bars (plain)
1 1/2 c. chopped nuts

Mix all ingredients together (except the chocolate and nuts). Spread onto a greased cookie sheet.

Bake 350°F for 25 minutes. While still hot, place chocolate bars on top to melt. When melted, sprinkle nuts over. Let cool and slice into bars.