1 c. butter
1 c. brown sugar
1 egg yolk
2 c. flour
1 tsp. vanilla
1 (6 oz.) pkg. chocolate chips
Chopped nuts

Mix together butter, brown sugar, egg yolk, vanilla, then flour. Spread in ungreased 10 x 15 cookie pan. Bake about 20 minutes at 300 degrees. Melt chips and spread over top. (Chopped nuts can be sprinkled over top). When partially cooled, cut into small squares or diamonds.