This is a recipe from my mom. I am not sure who found it, but I believe it was my Grandmother McElwain.
Soften one package of yeast (2 ¼ tsp) in 1/4 cup very warm water.
Mix together 3 3/4 cups flour and 1/2 tsp salt in bowl.
Cut in 1 cup butter until particles are the size of peas.
Blend in 2 eggs, 1/2 cup sour cream, 1 tsp vanilla, and the yeast. Mix thoroughly. Cover; chill at least 2 hours.
Combine 1 1/2 cups sugar with 2 tsp vanilla
Roll out half of chilled dough on counter which has been sprinkled with about 1/2 cup of vanilla sugar. Roll out to a 16 x 8 rectangle. Sprinkle with about 2TB more vanilla sugar. Fold one end of dough over center. Fold other end over to make three layers. Turn 1/4 way around and repeat rolling and folding twice, sprinkling board and dough with additional vanilla sugar as needed. Roll out finally to 16 x 8 rectangle again about 1/4 inch thick. Cut into 4 x 1 inch strips. Twist each strip 2 or three times. Place on greased cookie sheet. Bake at 375 degrees for about 15-20 minutes until light golden brown. (DO NOT UNDERBAKE or it will be doughy). Repeat with remaining chilled dough.