Thumbprint Cookies
["3/4 lb. butter or margarine", "1 c. sugar", "2 egg yolks", "3 c. flour", "jelly of choice"]
["Mix sugar and butter.", "Stir in egg yolks.", "Gradually add 3 cups flour; mix well.", "Roll into small balls and place on lightly greased cookie sheet.", "Dip finger in water and make shallow depression in each ball of dough.", "Put a bit of jelly (color of your choice) in each depression.", "Bake at 350\u00b0 until lightly browned.", "(This is a good recipe to make when also making Forgotten Cookies, as the remaining egg yolks are used.)"]
["butter", "sugar", "egg yolks", "flour", "choice"]