Ukrainian Sugar Cookies
["2 c. sugar", "1 c. butter", "2 egg yolks", "1 c. sour cream", "2 to 3 c. flour (enough for rolling consistency)", "1 1/2 tsp. baking soda", "1/2 tsp. salt", "1 tsp. vanilla"]
["Cream sugar and shortening.", "Add beaten egg yolks and sour cream.", "Sift dry ingredients, using enough flour so dough can be easily handled.", "Roll thin; cut into desired shapes.", "Sprinkle with sugar.", "Bake at 350\u00b0 for 10 minutes."]
["sugar", "butter", "egg yolks", "sour cream", "flour", "baking soda", "salt", "vanilla"]