Cream butter and sugar together until light and fluffy. Beat in the eggs, sour cream, and vanilla. Mix in 1 cup flour, salt and baking soda. Add remaining flour a little at a time and mix until combined.
Empty dough onto plastic wrap, shape into a disk, wrap up, and refrigerate for at least 1 hour.
Preheat oven to 350 degrees F.
Divide the dough in two portions. Take one portion and roll out to about 1/4 inch thick making a a rectangle of about 6x16 inches.