Mix the butter/margarine, eggs and sugar. Now incorporate the sour cream and vanilla mix well. Mix dry ingredients in sepeate bowl,once mixed add dry ingredients into wet ingredients mix well.
Drop by teaspoons onto greased cookie sheet or put parchment paper on cookie sheet. Now sprinkle cookies with colored sugars. For Christmas time we use red & green sugars. I have also used the non pariels.
Bake cookies @ 350 degrees for 10-12 mins. until lightly brown around the edged & When touched they should spring back.