Directions:

Cut butter into flour throroughly. Blend in sour cream. Divide dough into 4 equal parts; wrap each part and chill at least 8 hours. Heat oven to 350 F. On well-floured cloth-covered board, roll each part of pastry into rectangle, 12x6 inches. Sprinkle with 2 tablespoons of the cheese. Fold ends to meet in center, forming a square. Sprinkle with 1 tablespoon of the cheese. Fold in folded edges to meet in center. Fold in half lengthwise (as if you were closing a book). Flatten lightly ; fold again lengthwise. On the folded edge, cut 3/16-inch slices. Place on ungreased baking sheet; bring the ends together to form a fan. Bake 20 to 25 minutes.