Day 1 - Grandma Vasko's Butter Cookies

(Day 1 of the 12 Days of Holiday cookies. Look for another recipe tomorrow.)

1 c. sugar
1 c. butter
1 tsp. baking powder
3 egg yolks
3 c. flour

Preheat oven to 350 degrees. Cream butter and sugar until light and fluffy. Add eggs and combine. Combine flower and baking powder. Add to butter mixture, one cup at a time, combining thoroughly after each addition. Roll out on floured board to approximately 1/8-inch thickness. Cut with cookie cutters. Bake on cookie sheets until lightly brown on bottom. Cool. Decorate with butter cream icing of your choice.