1 c. butter
1 c. brown sugar, packed
1 egg yolk
1 tsp. vanilla
1/4 tsp. salt
2 c. sifted all-purpose flour
1/2 lb. sweet chocolate, melted
1/2 c. chopped nuts

Cream butter; add sugar gradually. Blend in egg yolk, vanilla, salt and flour. Spread in greased 10 x 15 x 1 inch pan, or in a rectangle about 10 x 15 inch on a greased cookie sheet. Bake at 350 degrees about 20 minutes. Spread while hot with melted chocolate; sprinkle with chopped nuts. Cool and cut into squares.