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I should say melt in 'my' mouth. These cookies turned out wonderful. I think for the safety of my wasteline I will never make them again.
Here's the recipe ( from Better Homes and Garden's Cookbook)
1/2 cup butter, softened
1/2 cup shortening
2 cups sugar
1 teaspoon baking soda
1 teaspoon cream of tartar
1/8 teaspoon salt
3 egg yolks
1/2 teaspoon vanilla
1 3/4 cups all-purpose flour
Mix together butter and shortening. Add sugar, baking soda, cream of tartar, and salt. Beat until combined. Beat in egg yolks and vanilla. Beat in as much flour as you can and stir in the remaining flour.
Shape dough into 1 inch balls. Place 2 inches apart on ungreased cookie sheet. Bake in 300 oven for about 15 minutes or until sides are set. Do not let edges brown. Cool on cookie sheet for one minute and transfer to wire rack and let cool. Yields approximately 60 cookies.