Melt-in-Your-Mouth Sugar Cookies

Melt-in-Your-Mouth Sugar Cookies (Better Homes and Gardens)

½ c butter, softened
½ c shortening
2 c sugar
1 tsp baking soda
1 tsp cream of tartar
⅛ tsp salt
3 egg yolks
½ tsp vanilla
1¾ c all-purpose flour

In a large mixing bowl beat butter and shortening with an electric mixer on medium to high speed for 30 seconds. Add sugar, baking soda, cream of tartar, and salt. Beat until combined scraping sides of bowl occasionally. Beat in egg yolks and vanilla until combined. Beat in as much flour as you can. Stir in remaining flour.
Shape dough into 1-inch balls. Place 2 inches apart on an ungreased cookie sheet. Bake in a 300° oven about 15 minutes or until sides are set (do not let edges brown). Cool on cookie sheet for 1 minute. Transfer to a wire rack and let cool.

Courtesy of Desirae Young