Cream the butter, egg, vanilla, and sour cream together. Then add the dry ingredients.The dough will be sticky, I ivide it to make it easier to work with. Work the dough with some flour just enough so it can be rolled out and cut with cookie cutters. Roll it out to about a fat ¼ inch. Just before you are done sprinkle sugar over the dough then lightly roll the sugar in. Bake at 425 degrees for about 8 min.
Recipe by Amish 365 at https://www.amish365.com/sour-cream-sugar-cookies/