4 c. flour
2 pkg. yeast
4 egg yolks
1 c. sour cream
1 tsp. salt
1 1/4 c. shortening
1 tsp. vanilla
2 tbsp. sugar

Sift together flour, sugar, salt and yeast. Cut in shortening until dough resembles pie dough. Add egg yolks, vanilla and sour cream. Mix with hands until dough forms a ball. Divide into 5 even balls and refrigerate. Sprinkle bread board with powdered sugar and roll each ball of dough into a 12 inch circle. Cut each circle into 6 pie shaped pieces. Spread with filling and roll up, starting at the wide end.

Bake at 375 degrees for 15 minutes. Butter horns will be a light golden color when done. Frost while still warm with a powdered sugar frosting.

FILLING:

4 egg whites
1 c. powdered sugar
1 tsp. vanilla
1 1/2 c. walnuts, chopped fine

Beat egg whites until stiff. Add sugar and vanilla; beat well. Fold in walnuts. Spread on dough.