Butter Cookies
["1 c. sugar", "3/4 lb. butter", "3 egg yolks", "1 tsp. vanilla", "4 c. flour", "1/4 c. jelly or preserves"]
["Blend together sugar and butter.", "Add egg yolks and vanilla. Beat at medium speed for 2 minutes, scraping sides of bowl.", "Stir in flour, one cup at a time, blending until stiff dough forms."]
["sugar", "butter", "egg yolks", "vanilla", "flour", "preserves"]