Holiday Fun Sugar Cookies

In a medium bowl, combine flour, baking soda and cream of tartar; set aside. In large mixing bowl, cream together the butter and powdered sugar until fluffy. Add egg and extracts and beat well. Stir in flour mixture until just mixed. Cover and refrigerate dough for at least 2 hours. Preheat oven to 375 °F (190 °C) . Lightly grease baking sheets. Divide dough in half. Roll each half 1/4-inch think on a lightly floured surface. Cut into desired shapes with 2 to 2 1/2-inch cookie cutters. Place cookies about 2-inches apart on baking sheets. Bake on top rack of oven for 8 to 10 minutes or until edges are lightly browned. Transfer to wire racks to cool. Decorate cookies with Thin Icing and assorted cake/cookie sprinkles. Allow to dry completely before storing in airtight container.