1 c. butter
1 c. brown sugar
1 beaten egg yolk
2 c. sifted flour
1 tsp. vanilla
1 (6 oz.) pkg. mint chocolate chips or 1 (8 oz.) Hershey

Cream butter and sugar. Then mix in order. Spread on cookie sheet. Pat down firmly and bake at 250 degrees for 20 minutes. Melt chocolate and spread over while hot. Sprinkle with 1/2 cup chopped nuts (optional). Cut while warm.