Sour Cream Cookies
["1 c. sweet butter", "1 1/2 c. sugar", "2 egg yolks", "1 tsp. vanilla", "1/4 tsp. salt", "1 tsp. baking soda", "1 tsp. baking powder", "1 c. sour cream", "5 c. all-purpose flour"]
["Preheat oven to 350\u00b0.", "Lightly grease cookie sheets.", "Cream butter until fluffy.", "Beat in egg yolks, then vanilla, salt, baking soda, baking powder and sour cream.", "Gradually add flour until all is incorporated.", "Roll dough to 1/8-inch thickness on lightly floured board.", "Cut into desired shapes.", "Place 1/2-inch apart on prepared sheets.", "Bake 15 minutes.", "Cool 1 to 2 minutes on sheets, then remove to wire racks.", "Ice or decorate as desired."]
["sweet butter", "sugar", "egg yolks", "vanilla", "salt", "baking soda", "baking powder", "sour cream", "flour"]