Melt In Your Mouth Cookies
["6 hard-boiled egg yolks", "3 sticks butter, softened", "3 3/4 c. flour", "3/4 c. sugar", "2 1/2 Tbsp. vanilla", "colored sprinkles", "1/8 c. milk or 1 egg yolk", "powdered sugar (for dusting)"]
["Sift egg yolks very fine into large bowl.", "Mix in butter, flour, sugar and vanilla.", "Thoroughly mix with hands (warmth from hands helps bind dough).", "Roll into 2 1/2 to 2-inch round logs. Freeze or refrigerate until firm.", "Slice cookies 1/4-inch thick. Place on cookie sheet.", "Using milk or egg white, brush on cookies to help sprinkles stick.", "Bake at 325\u00b0 for 5 to 7 minutes, until edges only are light golden brown.", "Dust with sugar.", "Remove carefully."]
["egg yolks", "butter", "flour", "sugar", "vanilla", "colored sprinkles", "milk", "powdered sugar"]