Thumbprint Cookies
["2/3 c. butter", "1/3 c. sugar", "2 egg yolks", "1 tsp. vanilla", "1 1/2 c. sifted flour", "2 slightly beaten egg whites", "3/4 c. chopped walnuts", "maraschino cherries"]
["Cream butter and sugar until fluffy.", "Add egg yolks, vanilla and 1/2 teaspoon of salt; beat well.", "Gradually add flour, mixing well.", "Shape in 3/4-inch balls; dip in egg whites and roll in nuts."]
["butter", "sugar", "egg yolks", "vanilla", "flour", "egg whites", "walnuts", "maraschino cherries"]