Soft Sugar Cookies

This is my favorite recipe for sugar cookies, they are so yummy!

1 cup butter
2 cups sugar
2 eggs
2 tsp vanilla
1 cup sour cream
1 tsp salt
2 tsp baking soda
5 cups flour

In mixer cream butter and sugar, then add eggs and vanilla.  Add sour cream.  Combine salt, soda, and flour and add to mixture.  Roll out on floured surface to about 1/4 to 1/3 inch thick. 
Bake at 375 for 9-10 min.