In a bowl, cream butter, cream cheese and sugar. Beat in egg yolk and extracts. Combine the flour, salt and baking soda; gradually add to creamed mixture. Cover and refrigerate for 3 hours or until easy to handle., Preheat oven to 375°. On a lightly floured surface, roll out dough to 1/8-in. thickness. Cut with a 2-1/2-in. cookie cutter dipped in flour. Place 1 in. apart on ungreased baking sheets. Bake until edges begin to brown, 8-10 minutes. Cool for 2 minutes before removing from pans to wire racks. Decorate as desired.