1/2 lb. butter
2 egg yolks
1 tsp. vanilla
2 c. sifted flour
1/2 c. sour cream

Mix butter and flour like pie dough. Beat egg yolks, sour cream, and vanilla. Mix all together. Make 4 balls. Cover and let stand one hour in winter or overnight in refrigerator when hot. Roll out like noodle dough. Cut in squares 2 x 2 inches. Make two knife cuts in square. Bake on ungreased cookie sheet at 325 degrees for 5 minutes. Must be light in color. Sprinkle with powdered sugar. Very delicate and delicious.